Appendix C -- Sampling Design Plan

SCHOOL SURVEY ON CRIME AND SAFETY 2005--06

## SAMPLING DESIGN PLAN

## 

**Introduction**

The School Survey on Crime and Safety (SSOCS) is conducted by the
National Center for Education Statistics (NCES) on behalf of the United
States Department of Education. SSOCS is the only NCES survey that
collects data on the frequency of crime and violence from America's
public primary, middle, high, and combined schools. Data from this
collection can be used to correlate school characteristics with violent
and serious violent crimes in American schools. Data from SSOCS can also
be used to assess what school programs, practices, and policies are used
by schools in an effort to prevent crime. SSOCS has been conducted
twice, in school years 1999--2000 and 2003--04.

The following report outlines the recommended sampling design for SSOCS
2005--06 (SSOCS:2006). The same general approach used in SSOCS 2003--04
(SSOCS:2004) will be used for SSOCS:2006. A brief description of the
SSOCS:2004 sample design is provided below. It is followed by the
preliminary sampling plan for SSOCS:2006.

**Sample Design for SSOCS:2004**

A stratified sampling design was used to select schools for the
SSOCS:2004. For sample allocation and sample selection, strata were
defined by instructional level, type of locale, and enrollment size.
Within each of four instructional level categories, sample was allocated
to each of 16 subgroups formed by the cross classification of size (four
levels) and locale (four levels), in proportion to an aggregate measure
of size derived for each subgroup. Aggregate measure of size for a
specific locale\*size cell within an instructional level is equal to the
sum of the square root of school enrollment.

The initial goal of SSOCS:2004 was to collect data from an effective
sample of 2,550 schools. Based on the aggregate measure of size, the
desired sample of 2,550 schools was allocated to the four instructional
levels as follows: 640 primary schools, 895 middle schools, 915 schools
high schools, and 100 combined schools.[^1] Within instructional level,
the overall sample of schools was then allocated to each stratum in
proportion to the measure of size.

After the allocation for each stratum was determined, percent
minority[^2] and region[^3] were used as implicit stratification
variables by sorting the school lists in each stratum by these variables
before sample selection. An example of this procedure and the formulas
used for calculating this measure of size are provided below.

The precision of the estimated percentage of schools with violent
incidents and other key variables during the year 2003--04 and the
precision of subgroup comparisons in terms of the power in detecting
various differences between subgroups of schools achieved by this design
are given later in this report.

**Sample Design for SSOCS:2006**

It is recommended that the same general sampling design used for
SSOCS:2004 be adopted for the selection of schools in SSOCS:2006, with
regard to the stratification variables, the number of strata, the method
of sample allocation and the sorting of variables before selection.

The two main objectives for the sampling design of SSOCS:2006 are
identical to those for SSOCS:2004: (1) to obtain overall cross-sectional
and sub-group estimates of important indicators of school crime and
safety, and (2) to have precise estimates of change in various
characteristics relating to crime between the 2003--04 and 2005--06
SSOCS administrations. Adopting the same basic design increases the
precision of the estimate of change. For sample allocation and sample
selection purposes, strata were defined in both administrations of SSOCS
by crossing instructional level, type of locale, and enrollment size. In
addition, minority status and region were used as implicit
stratification variables by sorting schools by these variables within
each stratum before sample selection. The three explicit and two
implicit stratification variables have been shown to be related to
school crime and thus create meaningful strata for this survey.

Like SSOCS:2004, the sample design will not account for other NCES
surveys in the field at the same time as SSOCS. Selecting a sample that
avoids or minimizes overlap would unnecessarily complicate the sampling
design and would required complex computations of probabilities prior to
sample selection as well as complex weighting post-data collection.

SSOCS:2006 will take advantage of the lessons learned from the 2004 data
collection. Response rates achieved for various strata and substrata in
SSOCS:2004 will be examined in order to determine the proper size of the
initial sample selection for 2006 (see table 1). Table 2 contains
speculated SSOCS:2006 response rates by type of locale, enrollment size,
and minority status. When speculating the 2006 response rates, the goal
was to ensure a sufficient number of completed cases for analysis.

  ------------------------- ----------- ----------- ----------------- ------------ ------------ --
  **Table 1.--Distribution                                                                      
  of sample schools by                                                                          
  response status and                                                                           
  weighted response rate of                                                                     
  the SSOCS:2004 sample, by                                                                     
  selected school                                                                               
  characteristics: School                                                                       
  year 2003--04**                                                                               

                                                                                                

  School characteristics    Initial     Completed   Non-respondents   Ineligible   Unweighted   
                            Sample      surveys                                    response     
                                                                                   rate (%)     

                                                                                                

  **Total**                 **3,743**   **2,772**   **940**           **31**       **74.7**     

                                                                                                

  Instructional level                                                                           

  Primary                   941         692         239               10           74.3         

  Middle                    1,315       969         335               11           74.3         

  High School               1,362       1,009       346               7            74.5         

  Combined                  125         102         20                3            83.6         

                                                                                                

  Enrollment size                                                                               

  Less than 300             361         291         53                17           84.6         

  300--499                  651         509         134               8            79.2         

  500--999                  1,460       1,079       378               3            74.1         

  1,000 or more             1,271       893         375               3            70.4         

                                                                                                

  Type of locale                                                                                

  City                      1,056       728         319               9            69.5         

  Urban fringe              1,438       1,028       396               14           72.2         

  Town                      446         367         73                6            83.4         

  Rural                     803         649         152               2            81.0         

                                                                                                

  Percent minority                                                                              

  Less than 5               656         547         104               5            84.0         
  percent/missing                                                                               

  5 to 19 percent           1,019       763         247               9            75.5         

  20 to 49 percent          908         660         242               6            73.2         

  50 percent or more        1,160       802         347               11           69.8         

                                                                                                

  Region                                                                                        

  Northeast                 744         513         226               5            69.4         

  Southeast                 881         684         191               6            78.2         

  Central                   906         704         195               7            78.3         

  West                      1,212       871         328               13           72.6         

  SOURCE: U.S. Department                                                                       
  of Education, National                                                                        
  Center for Education                                                                          
  Statistics, School Survey                                                                     
  on Crime and Safety,                                                                          
  2004.                                                                                         

  ^1^ In SSOCS:2004, a                                                                          
  minimum of 60 percent of                                                                      
  the 227 sub-items in the                                                                      
  questionnaire were                                                                            
  required to consider a                                                                        
  survey complete. Of the                                                                       
  227 sub-items, a minimum                                                                      
  of 80 percent of the 101                                                                      
  critical sub-items were                                                                       
  required before a survey                                                                      
  could be considered                                                                           
  complete.                                                                                     

  ^2^ Nonrespondents                                                                            
  include those eligible                                                                        
  schools that did not                                                                          
  answer the minimum number                                                                     
  of items required to be                                                                       
  considered a complete.                                                                        

  ^3^ Ineligible schools                                                                        
  include those that had                                                                        
  closed, merged with                                                                           
  another school at a new                                                                       
  location, or changed from                                                                     
  a regular public school                                                                       
  to an alternative school.                                                                     

  ^4^ The unweighted                                                                            
  response rate is                                                                              
  calculated as the ratio:                                                                      
  (completed cases) /                                                                           
  (total sample - known                                                                         
  ineligibles)                                                                                  
  ------------------------- ----------- ----------- ----------------- ------------ ------------ --

**Table 2. Response rates\* speculated for SSOCS 2006 by type of locale,
enrollment size, and minority status**

+---------+---------+------------+--------+--------+--------+--------+
|         |         |            | P      |        |        |        |
|         |         |            | ercent |        |        |        |
|         |         |            | mi     |        |        |        |
|         |         |            | nority |        |        |        |
|         |         |            | enrol  |        |        |        |
|         |         |            | lment† |        |        |        |
+---------+---------+------------+--------+--------+--------+--------+
| Instru  | Type    | Enrollment | Less   | 5 to   | 20 to  | 50% or |
| ctional |         |            |        | 20%    | 50%    |        |
|         | of      | size of    | than   |        |        | more   |
| Level   | locale  | school     | 5%     |        |        |        |
+---------+---------+------------+--------+--------+--------+--------+
| All     | > City  | Less than  | 95%    | 92%    | 86%    | 83%    |
| levels  |         | 300        |        |        |        |        |
+---------+---------+------------+--------+--------+--------+--------+
|         |         | 300 to 499 | 95%    | 92%    | 86%    | 83%    |
+---------+---------+------------+--------+--------+--------+--------+
|         |         | 500 to 999 | 95%    | 92%    | 86%    | 83%    |
+---------+---------+------------+--------+--------+--------+--------+
|         |         | 1,000+     | 90%    | 85%    | 80%    | 80%    |
+---------+---------+------------+--------+--------+--------+--------+
|         | > Urban | Less than  | 96%    | 95%    | 91%    | 87%    |
|         | >       | 300        |        |        |        |        |
|         |  fringe |            |        |        |        |        |
+---------+---------+------------+--------+--------+--------+--------+
|         |         | 300 to 499 | 95%    | 93%    | 90%    | 87%    |
+---------+---------+------------+--------+--------+--------+--------+
|         |         | 500 to 999 | 95%    | 93%    | 90%    | 86%    |
+---------+---------+------------+--------+--------+--------+--------+
|         |         | 1,000+     | 92%    | 90%    | 87%    | 85%    |
+---------+---------+------------+--------+--------+--------+--------+
|         | > Town  | Less than  | 96%    | 95%    | 91%    | 87%    |
|         |         | 300        |        |        |        |        |
+---------+---------+------------+--------+--------+--------+--------+
|         |         | 300 to 499 | 95%    | 93%    | 89%    | 86%    |
+---------+---------+------------+--------+--------+--------+--------+
|         |         | 500 to 999 | 95%    | 93%    | 89%    | 86%    |
+---------+---------+------------+--------+--------+--------+--------+
|         |         | 1,000+     | 92%    | 92%    | 90%    | 85%    |
+---------+---------+------------+--------+--------+--------+--------+
|         | > Rural | Less than  | 96%    | 95%    | 93%    | 90%    |
|         |         | 300        |        |        |        |        |
+---------+---------+------------+--------+--------+--------+--------+
|         |         | 300 to 499 | 96%    | 95%    | 93%    | 90%    |
+---------+---------+------------+--------+--------+--------+--------+
|         |         | 500 to 999 | 96%    | 95%    | 93%    | 90%    |
+---------+---------+------------+--------+--------+--------+--------+
|         |         | 1,000+     | 96%    | 95%    | 93%    | 90%    |
+---------+---------+------------+--------+--------+--------+--------+

> \* Speculated response rates were rough estimates based on response
> rates achieved in 1996-97 FRSS survey on school violence.
>
> † Categories are based on information in the 1997-98 CCD file and are
> intended to illustrate the variation in percent minority enrollment.
> Schools for which minority enrollment is missing in the CCD file are
> included in the "less than 5%" category. For analysis purposes,
> categories based on reported minority enrollment should be used and
> need not coincide with those given here.

SOURCE: U.S. Department of Education, National Center for Education
Statistics, School Survey on Crime and Safety, 2000.

**Sampling Frame.** The sampling frame for the SSOCS:2006 will be
constructed from the 2003--04 Common Core of Data (CCD) Public School
Universe file. The CCD is an annual national database containing
information on all public K--12 schools and school districts. Certain
types of schools are excluded from the CCD Public School Universe File
in order to meet the sampling needs of SSOCS.

The SSOCS:2006 sampling frame will exclude the following schools:

-   ungraded schools;

-   domestic and overseas Department of Defense (DoD) schools;

-   Bureau of Indian Affairs (BIA) schools;

-   those schools in the outlying U.S. territories;

-   newly closed schools;

-   home schools;

-   schools with high grades of kindergarten or lower;

-   local education agencies that appear to be schools

-   schools specializing in special education, alternative education or
    juvenile halls

-   schools with zero students.

> Some additional changes to the frame will be made to meet the needs of
> SSOCS:

-   missing data for minority enrollment will be imputed;

-   locale data will be collapsed from 8 categories to 4;

-   a school level variable (i.e., primary, middle, high school,
    combined) will be created using the variables that indicate the
    school's low grade and the school's high grade;

-   a variable describing the percent of minority enrollment will be
    created.

After SSOCS-specific exclusions, the number of schools in the SSOCS:2006
frame will be similar to the number of schools in the SASS 2003-04
sampling frame, which is based on the 2001--02 CCD. Table 3 currently
summarizes the distribution of the SSOCS eligible schools from the
2003-2004 SASS frame by grade span to provide a general reference of the
approximate number of regular schools expected in the 2003--04 CCD, by
instructional level. When the final 2003--04 CCD Public School Universe
file is released and the specifications to prepare the sampling frame
are complete, Table 3 will be updated.

######## 

######## Table 3: Number of regular schools in the 2003-2004 SASS frame by instructional level\*

  ------- ------- ------------------ ------- ------- -------- -------- ------------- -------- ----- ----- ----- -------- --------
          High                                                                                                           
          grade                                                                                                          

  Low     1       2                  3       4       5        6        7             8        9     10    11    12       Total
  grade                                                                                                                  

                                                                                                                         

  PK      260     695                622     1,248   9,859    4,067    136           1,911    16    6     9     1,522    20,351

  K       181     594                830     1,731   12,360   8,535    207           3,123    63    26    15    1,393    29,058

  1       9       90                 124     190     560      214      10            85       5     1     1     40       1,329

  2               12                 111     85      161      59       5             19       0     2     2     15       471

  3                                  10      127     826      214      13            76       2     1     0     21       1,290

  4                                          15      350      517      30            324      9     2     2     51       1,300

  5                                                  34       446      71            1,307    14    9     3     87       1,971

  6                                                           88       125           8,285    118   38    28    800      9,482

  7                                                                    17            2,125    570   15    11    2,070    4,808

  8                                                                                  26       106   5     5     417      559

  9                                                                                           67    69    38    10,352   10,526

  10                                                                                                5     0     395      400

  11                                                                                                      5     51       56

  12                                                                                                            11       11

                                                                                                                         

  Total   450     1,391              1,697   3,396   24,150   14,140   614           17,281   970   179   119   17,225   81,612

                                                                                                                         

                  Elementary                                           Lowest grade                                      
                  (49,359)                                             \<= 3 and                                         
                                                                       highest grade                                     
                                                                       \<=8                                              

                                                                                                                         

                  Middle/junior high                                   Lowest grade                                      
                  (14,644)                                             \>=4 and                                          
                                                                       highest grade                                     
                                                                       \<=9                                              

                                                                                                                         

                  Secondary/senior                                     Lowest grade                                      
                  high (10,926)                                        \>= 9 and                                         
                                                                       highest grade                                     
                                                                       \<= 12                                            
                                                                       (secondary)                                       
                                                                       or lowest                                         
                                                                       grade \>=9                                        
                                                                       and highest                                       
                                                                       grade = 12                                        
                                                                       (senior high)                                     

                                                                                                                         

                  Combined (6,683)                                     Lowest grade                                      
                                                                       \<= 8;                                            
                                                                       highest grade                                     
                                                                       \> 8 if                                           
                                                                       lowest grade                                      
                                                                       \<= 3;                                            
                                                                       highest grade                                     
                                                                       \> 9 if                                           
                                                                       lowest grade                                      
                                                                       \> 3                                              

                                                                                                                         
  ------- ------- ------------------ ------- ------- -------- -------- ------------- -------- ----- ----- ----- -------- --------

\*Counts exclude schools in the outlying U.S. territories, nonregular
schools such as special education, vocational, alternative/other
schools, ungraded schools, schools with a high grade of kindergarten or
lower, BIA schools and DoD schools.

SOURCE: U.S. Department of Education, National Center for Education
Statistics, Schools and Staffing Survey, 2003-2004.

Tables 4A through 4C and tables 5A through 5H summarize the distribution
of the eligible regular schools in the SSOCS:2004 frame by instructional
level, type of locale[^4], enrollment size, minority status and region.
The current estimates in these tables are based on the 2001--02 SASS
sampling frame. They are expected to be similar to those based on the
2003--04 CCD. Similar to table 3 above, tables 4A through 4C and tables
5A through 5H will be updated with data from the SSOCS:2006 frame when
the proper adjustments are made to the 2003--04 CCD School Universe File
to create the SSOCS:2006 sampling frame.

To impute missing minority data on the frame, a new variable will be
created for those schools with nonmissing minority enrollment data. To
determine the percent minority for these "donor" schools, the number of
Asian students, Black/African American students, Hispanic students, and
Native American students will be summed to obtain the total number of
minority students. This figure will then be divided by the total
enrollment for the school. After this percent minority variable is
created, we will impute the percent minority for schools with missing
minority enrollment data[^5]. County will be used to define the donor
pools (that is, a school with missing data will be randomly assigned the
values from a school with non-missing data within the same county).[^6]
This was done for all states except for Tennessee, as all Tennessee
schools were missing race ethnicity data. Rather than using Hotdeck
imputation, Census 2000 data were used to determine the overall state
percentage of minority residents. This percent was then applied to all
Tennessee schools with missing data.

> Table 4A: Number of SSOCS eligible schools and enrollment in the
> 2003-2004 SASS/CCD public school universe file, by instructional level
> and type of locale\*

+-------------------+---------------------+-----------+-----------------+
| Instructional     | Type of locale†     | Number    | Total           |
| level             |                     |           |                 |
|                   |                     | of        | enrollment      |
|                   |                     | regular   |                 |
|                   |                     |           | in schools      |
|                   |                     | schools   |                 |
+-------------------+---------------------+-----------+-----------------+
| > Elementary      | > City              | 13,665    | 7,126,914       |
+-------------------+---------------------+-----------+-----------------+
|                   | > Urban Fringe      | 17,132    | 8,906,195       |
+-------------------+---------------------+-----------+-----------------+
|                   | > Town              | 5,207     | 2,042,675       |
+-------------------+---------------------+-----------+-----------------+
|                   | > Rural             | 13,355    | 4,592,393       |
+-------------------+---------------------+-----------+-----------------+
|                   | > *Total            | 49,359    | 22,668,177      |
|                   | > Elementary*       |           |                 |
+-------------------+---------------------+-----------+-----------------+
|                   |                     |           |                 |
+-------------------+---------------------+-----------+-----------------+
| > Middle          | > City              | 3,414     | 2,665,164       |
+-------------------+---------------------+-----------+-----------------+
|                   | > Urban Fringe      | 5,460     | 4,116,508       |
+-------------------+---------------------+-----------+-----------------+
|                   | > Town              | 2,315     | 1,149,458       |
+-------------------+---------------------+-----------+-----------------+
|                   | > Rural             | 3,455     | 1,668,340       |
+-------------------+---------------------+-----------+-----------------+
|                   | > *Total Middle*    | 14,644    | 9,599,470       |
+-------------------+---------------------+-----------+-----------------+
| > Secondary       | > City              | 2,313     | 3,281,473       |
+-------------------+---------------------+-----------+-----------------+
|                   | > Urban Fringe      | 3,615     | 4,764,231       |
+-------------------+---------------------+-----------+-----------------+
|                   | > Town              | 1,813     | 1,346,173       |
+-------------------+---------------------+-----------+-----------------+
|                   | > Rural             | 3,185     | 1,974,354       |
+-------------------+---------------------+-----------+-----------------+
|                   | > *Total Secondary* | 10,926    | 11,366,231      |
+-------------------+---------------------+-----------+-----------------+
| > Combined        | > City              | 817       | 436,010         |
+-------------------+---------------------+-----------+-----------------+
|                   | > Urban Fringe      | 901       | 602,911         |
+-------------------+---------------------+-----------+-----------------+
|                   | > Town              | 622       | 333,950         |
+-------------------+---------------------+-----------+-----------------+
|                   | > Rural             | 4,343     | 1,585,993       |
+-------------------+---------------------+-----------+-----------------+
|                   | > *Total Combined*  | 6,683     | 2,958,864       |
+-------------------+---------------------+-----------+-----------------+
| > All Levels      | > City              | 20,209    | 13,509,561      |
+-------------------+---------------------+-----------+-----------------+
|                   | > Urban Fringe      | 27,108    | 18,389,845      |
+-------------------+---------------------+-----------+-----------------+
|                   | > Town              | 9,957     | 4,872,256       |
+-------------------+---------------------+-----------+-----------------+
|                   | > Rural             | 24,338    | 9,821,080       |
+-------------------+---------------------+-----------+-----------------+
|                   | > *Total All        | 81,612    | 46,592,742      |
|                   | > Levels*           |           |                 |
+-------------------+---------------------+-----------+-----------------+

\* Counts exclude schools in the outlying U.S. territories, nonregular
schools such as special education, vocational, alternative/other
schools, ungraded schools, schools with a high grade of kindergarten or
lower, BIA schools and DoD schools. See table 3 for definition of
instructional levels used in this table.

> † The following definitions in the 2001--02 CCD file apply to the type
> of locale. City: a central city of a consolidated metropolitan
> statistical area. Urban fringe: any incorporated place,
> Census-designated place, or non-place territory within a CMSA or MSA
> of a city, and defined as urban by the Census Bureau. Town: any
> incorporated place or Census-designated place with population greater
> than or equal to 2,500, and located outside a CMSA or MSA. Rural: any
> incorporated place, Census-designated place, or non-place territory
> designated as rural by the Census Bureau.
>
> SOURCE: U.S. Department of Education, National Center for Education
> Statistics, Schools and Staffing Survey, 2003-2004.
>
> Table 4B: Number of SSOCS eligible schools and enrollment in the
> 2003-2004 SASS/CCD public school universe file, by instructional level
> and enrollment size\*

+---------------+-----------------------+---------------+---------------+
| Instructional | Enrollment size†      | Number        | Total         |
| level         |                       |               |               |
|               |                       | of regular    | enrollment    |
|               |                       |               |               |
|               |                       | schools       | in schools    |
+---------------+-----------------------+---------------+---------------+
| > Elementary  | > 1\. Under 300       | 12,908        | 2,400,377     |
+---------------+-----------------------+---------------+---------------+
|               | > 2\. 300 to 499      | 17,457        | 6,988,388     |
+---------------+-----------------------+---------------+---------------+
|               | > 3\. 500 to 999      | 17,638        | 11,652,861    |
+---------------+-----------------------+---------------+---------------+
|               | > 4\. 1000+           | 1,356         | 1,626,551     |
+---------------+-----------------------+---------------+---------------+
|               | > *Total Elementary*  | 49,359        | 22,668,177    |
+---------------+-----------------------+---------------+---------------+
| > Middle      | > 1\. Under 300       | 2,231         | 439,605       |
+---------------+-----------------------+---------------+---------------+
|               | > 2\. 300 to 499      | 3,165         | 1,275,040     |
+---------------+-----------------------+---------------+---------------+
|               | > 3\. 500 to 999      | 7,070         | 5,093,624     |
+---------------+-----------------------+---------------+---------------+
|               | > 4\. 1000+           | 2,178         | 2,791,202     |
+---------------+-----------------------+---------------+---------------+
|               | #################     | 14,644        | 9,599,471     |
|               | ##################### |               |               |
|               | ##################### |               |               |
|               | ##################### |               |               |
|               | # Total Middle {#tota |               |               |
|               | l-middle .unnumbered} |               |               |
+---------------+-----------------------+---------------+---------------+
| > Secondary   | > 1\. Under 300       | 1,688         | 281,096       |
+---------------+-----------------------+---------------+---------------+
|               | > 2\. 300 to 499      | 1,497         | 594,219       |
+---------------+-----------------------+---------------+---------------+
|               | > 3\. 500 to 999      | 2,868         | 2,109,001     |
+---------------+-----------------------+---------------+---------------+
|               | > 4\. 1000+           | 4,873         | 8,381,914     |
+---------------+-----------------------+---------------+---------------+
|               | > *Total Secondary*   | 10,926        | 11,366,230    |
+---------------+-----------------------+---------------+---------------+
| > Combined    | > 1\. Under 300       | 3,074         | 473,621       |
+---------------+-----------------------+---------------+---------------+
|               | > 2\. 300 to 499      | 1,591         | 623,786       |
+---------------+-----------------------+---------------+---------------+
|               | > 3\. 500 to 999      | 1,477         | 1,009,839     |
+---------------+-----------------------+---------------+---------------+
|               | > 4\. 1000+           | 541           | 851,618       |
+---------------+-----------------------+---------------+---------------+
|               | > *Total Combined*    | 6,683         | 2,958,864     |
+---------------+-----------------------+---------------+---------------+
| > All Levels  | > 1\. Under 300       | 19,901        | 3,594,699     |
+---------------+-----------------------+---------------+---------------+
|               | > 2\. 300 to 499      | 23,710        | 9,481,433     |
+---------------+-----------------------+---------------+---------------+
|               | > 3\. 500 to 999      | 29,053        | 19,865,325    |
+---------------+-----------------------+---------------+---------------+
|               | > 4\. 1000+           | 8,948         | 13,651,285    |
+---------------+-----------------------+---------------+---------------+
|               | > *Total All Level*   | 81,612        | 46,592,742    |
+---------------+-----------------------+---------------+---------------+

> \* Counts exclude schools in the outlying U.S. territories, nonregular
> schools such as special education, vocational, alternative/other
> schools, ungraded schools, schools with a high grade of kindergarten
> or lower, BIA schools and DoD schools. See table 3 for definition of
> instructional levels used in this table.
>
> † Enrollment size categories are not necessarily optimized for
> analytic purposes. Different size categories for the various levels
> can be used in analysis if desired.
>
> SOURCE: U.S. Department of Education, National Center for Education
> Statistics, Schools and Staffing Survey, 2003-2004.
>
> Table 4C: Number of SSOCS eligible schools and enrollment in the
> 2003-2004 SASS/CCD public school universe file, by instructional level
> and percent minority enrollment\*

+---------------+-----------------------+---------------+---------------+
| Instructional | Percent minority      | Number        | Total         |
| level         | enrollment†           |               |               |
|               |                       | of regular    | enrollment    |
|               |                       |               |               |
|               |                       | schools       | in schools    |
+---------------+-----------------------+---------------+---------------+
| > Elementary  | > 1\. \<5%            | 10,932        | 3,752,821     |
+---------------+-----------------------+---------------+---------------+
|               | > 2\. 5 to 19%        | 11,719        | 4,986,459     |
+---------------+-----------------------+---------------+---------------+
|               | > 3\. 20 to 49%       | 10,747        | 5,192,705     |
+---------------+-----------------------+---------------+---------------+
|               | > 4\. 50% +           | 15,961        | 8,736,191     |
+---------------+-----------------------+---------------+---------------+
|               | > *Total Elementary*  | 49,359        | 22,668,176    |
+---------------+-----------------------+---------------+---------------+
| > Middle      | > 1\. \<5%            | 3,150         | 1,552,560     |
+---------------+-----------------------+---------------+---------------+
|               | > 2\. 5 to 19%        | 3,853         | 2,449,059     |
+---------------+-----------------------+---------------+---------------+
|               | > 3\. 20 to 49%       | 3,437         | 2,429,991     |
+---------------+-----------------------+---------------+---------------+
|               | > 4\. 50% +           | 4,204         | 3,167,861     |
+---------------+-----------------------+---------------+---------------+
|               | > *Total Middle*      | 14,644        | 9,599,471     |
+---------------+-----------------------+---------------+---------------+
| > Secondary   | > 1\. \<5%            | 3,025         | 1,981,679     |
+---------------+-----------------------+---------------+---------------+
|               | > 2\. 5 to 19%        | 2,864         | 2,964,067     |
+---------------+-----------------------+---------------+---------------+
|               | > 3\. 20 to 49%       | 2,439         | 3,002,515     |
+---------------+-----------------------+---------------+---------------+
|               | > 4\. 50% +           | 2,598         | 3,417,969     |
+---------------+-----------------------+---------------+---------------+
|               | > *Total Secondary*   | 10,926        | 11,366,230    |
+---------------+-----------------------+---------------+---------------+
| > Combined    | > 1\. \<5%            | 2,809         | 1,184,679     |
+---------------+-----------------------+---------------+---------------+
|               | > 2\. 5 to 19%        | 1,353         | 621,453       |
+---------------+-----------------------+---------------+---------------+
|               | > 3\. 20 to 49%       | 1,184         | 558,144       |
+---------------+-----------------------+---------------+---------------+
|               | > 4\. 50% +           | 1,337         | 594,588       |
+---------------+-----------------------+---------------+---------------+
|               | > *Total Combined*    | 6,683         | 2,958,864     |
+---------------+-----------------------+---------------+---------------+
| > All Levels  | > 1\. \<5%            | 19,916        | 8,471,739     |
+---------------+-----------------------+---------------+---------------+
|               | > 2\. 5 to 19%        | 19,789        | 11,021,038    |
+---------------+-----------------------+---------------+---------------+
|               | > 3\. 20 to 49%       | 17,807        | 11,183,355    |
+---------------+-----------------------+---------------+---------------+
|               | > 4\. 50% +           | 24,100        | 15,916,609    |
+---------------+-----------------------+---------------+---------------+
|               | > *Total All Levels*  | 81,612        | 46,592,741    |
+---------------+-----------------------+---------------+---------------+

> \* Counts exclude schools in the outlying U.S. territories, nonregular
> schools such as special education, vocational, alternative/other
> schools, ungraded schools, schools with a high grade of kindergarten
> or lower, BIA schools and DoD schools. See table 3 for definition of
> instructional levels used in this table.
>
> † Minority enrollment derived from racial/ethnic counts on the
> 34SASS/CCD. Included in the minority counts are the following
> racial/ethnic groups: American Indian or Alaskan Native, Asian or
> Pacific Islander, Hispanic, and Black non-Hispanic. These categories
> were chosen as those that have commonly been used. Other definitions
> of "minority" can be used in analysis.
>
> SOURCE: U.S. Department of Education, National Center for Education
> Statistics, Schools and Staffing Survey, 2003-04.

**Table 5A: Number of SSOCS eligible elementary schools in the 2003-2004
SASS/CCD frame, by type of locale, enrollment size, and minority
status**

+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        |          |       | Pe    |       |       |       |
|        |        |          |       | rcent |       |       |       |
|        |        |          |       | min   |       |       |       |
|        |        |          |       | ority |       |       |       |
|        |        |          |       | en    |       |       |       |
|        |        |          |       | rollm |       |       |       |
|        |        |          |       | ent\* |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
| I      | Type   | En       | N     | Less  | 5 to  | 20 to | 50%   |
| nstruc |        | rollment | umber |       | 19%   | 49%   | or    |
| tional | of     |          | of    | than  |       |       |       |
|        | locale | size of  | sc    | 5%    |       |       | more  |
| level  |        | school   | hools |       |       |       |       |
|        |        |          | in    |       |       |       |       |
|        |        |          | frame |       |       |       |       |
|        |        |          | (row  |       |       |       |       |
|        |        |          | t     |       |       |       |       |
|        |        |          | otal) |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
| Elem   | > City | Less     | 2,299 | 86    | 440   | 538   | 1235  |
| entary |        | than 300 |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 5,029 | 109   | 808   | 1244  | 2868  |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 5,690 | 45    | 571   | 1183  | 3891  |
|        |        | 999      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 647   | 3     | 25    | 49    | 570   |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | >      | Less     | 2,422 | 539   | 894   | 542   | 447   |
|        |  Urban | than 300 |       |       |       |       |       |
|        | >      |          |       |       |       |       |       |
|        | fringe |          |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 6,423 | 959   | 2224  | 1758  | 1482  |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 7,769 | 740   | 2147  | 2182  | 2700  |
|        |        | 999      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 518   | 21    | 76    | 106   | 315   |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | > Town | Less     | 1,744 | 522   | 637   | 333   | 252   |
|        |        | than 300 |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 2,188 | 469   | 745   | 498   | 476   |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 1,243 | 257   | 303   | 330   | 353   |
|        |        | 999      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 32    | 3     | 8     | 7     | 14    |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | >      | Less     | 6,443 | 3564  | 1574  | 713   | 592   |
|        |  Rural | than 300 |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 3,817 | 1628  | 1190  | 614   | 385   |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 2,936 | 828   | 1051  | 655   | 402   |
|        |        | 999      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 159   | 26    | 43    | 61    | 29    |
+--------+--------+----------+-------+-------+-------+-------+-------+
| *      |        |          | 4     | 9,799 | 1     | 1     | 1     |
| Total* |        |          | 9,359 |       | 2,736 | 0,813 | 6,011 |
+--------+--------+----------+-------+-------+-------+-------+-------+

\* Categories are intended to illustrate the variation in percent
minority enrollment.

SOURCE: U.S. Department of Education, National Center for Education
Statistics, Schools and Staffing Survey, 2003-2004.

**Table 5B: Number of SSOCS eligible middle schools in the 2003-2004
SASS/CCD frame, by type of locale, enrollment size, and minority
status**

+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        |          |       | Pe    |       |       |       |
|        |        |          |       | rcent |       |       |       |
|        |        |          |       | min   |       |       |       |
|        |        |          |       | ority |       |       |       |
|        |        |          |       | en    |       |       |       |
|        |        |          |       | rollm |       |       |       |
|        |        |          |       | ent\* |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
| I      | Type   | En       | N     | Less  | 5 to  | 20 to | 50%   |
| nstruc |        | rollment | umber |       | 19%   | 49%   | or    |
| tional | of     |          | of    | than  |       |       |       |
|        | locale | size of  | sc    | 5%    |       |       | more  |
| level  |        | school   | hools |       |       |       |       |
|        |        |          | in    |       |       |       |       |
|        |        |          | frame |       |       |       |       |
|        |        |          | (row  |       |       |       |       |
|        |        |          | t     |       |       |       |       |
|        |        |          | otal) |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
| Middle | > City | Less     | 241   | 2     | 36    | 30    | 173   |
|        |        | than 300 |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 449   | 13    | 76    | 80    | 280   |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 1,999 | 26    | 346   | 507   | 1,120 |
|        |        | 999      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 725   | 4     | 75    | 168   | 478   |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | >      | Less     | 374   | 97    | 94    | 80    | 103   |
|        |  Urban | than 300 |       |       |       |       |       |
|        | >      |          |       |       |       |       |       |
|        | fringe |          |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 935   | 265   | 305   | 226   | 139   |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 3,016 | 444   | 1,136 | 806   | 630   |
|        |        | 999      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 1,135 | 66    | 282   | 366   | 421   |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | > Town | Less     | 467   | 143   | 128   | 102   | 94    |
|        |        | than 300 |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 834   | 218   | 263   | 192   | 161   |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 948   | 180   | 317   | 241   | 210   |
|        |        | 999      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 66    | 9     | 19    | 23    | 15    |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | >      | Less     | 1,149 | 497   | 315   | 189   | 148   |
|        |  Rural | than 300 |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 947   | 449   | 255   | 134   | 109   |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 1,107 | 349   | 412   | 235   | 111   |
|        |        | 999      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 252   | 46    | 93    | 78    | 35    |
+--------+--------+----------+-------+-------+-------+-------+-------+
| *      |        |          | 1     | 2,808 | 4,152 | 3,457 | 4,227 |
| Total* |        |          | 4,644 |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+

\* Categories are intended to illustrate the variation in percent
minority enrollment.

SOURCE: U.S. Department of Education, National Center for Education
Statistics, Schools and Staffing Survey, 2003-2004.

**Table 5C: Number of SSOCS eligible secondary schools in the 2003-2004
SASS/CCD frame, by type of locale, enrollment size, and minority
status**

+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        |          |       | Pe    |       |       |       |
|        |        |          |       | rcent |       |       |       |
|        |        |          |       | min   |       |       |       |
|        |        |          |       | ority |       |       |       |
|        |        |          |       | en    |       |       |       |
|        |        |          |       | rollm |       |       |       |
|        |        |          |       | ent\* |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
| I      | Type   | En       | N     | Less  | 5 to  | 20 to | 50%   |
| nstruc |        | rollment | umber |       | 19%   | 49%   | or    |
| tional | of     |          | of    | than  |       |       |       |
|        | locale | size of  | sc    | 5%    |       |       | more  |
| level  |        | school   | hools |       |       |       |       |
|        |        |          | in    |       |       |       |       |
|        |        |          | frame |       |       |       |       |
|        |        |          | (row  |       |       |       |       |
|        |        |          | t     |       |       |       |       |
|        |        |          | otal) |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
| Sec    | > City | Less     | 283   | 8     | 32    | 59    | 184   |
| ondary |        | than 300 |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 114   | 3     | 12    | 17    | 82    |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 308   | 4     | 40    | 56    | 208   |
|        |        | 999      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 1,608 | 22    | 290   | 451   | 845   |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | >      | Less     | 209   | 25    | 55    | 56    | 73    |
|        |  Urban | than 300 |       |       |       |       |       |
|        | >      |          |       |       |       |       |       |
|        | fringe |          |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 231   | 78    | 71    | 51    | 31    |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 923   | 298   | 323   | 194   | 108   |
|        |        | 999      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 2,252 | 250   | 772   | 697   | 533   |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | > Town | Less     | 190   | 43    | 60    | 45    | 42    |
|        |        | than 300 |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 408   | 154   | 115   | 78    | 61    |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 776   | 282   | 258   | 140   | 96    |
|        |        | 999      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 439   | 80    | 171   | 113   | 75    |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | >      | Less     | 1,006 | 462   | 269   | 166   | 109   |
|        |  Rural | than 300 |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 744   | 414   | 178   | 79    | 73    |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 861   | 425   | 248   | 122   | 66    |
|        |        | 999      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 574   | 123   | 243   | 146   | 62    |
+--------+--------+----------+-------+-------+-------+-------+-------+
| *      |        |          | 1     | 2,671 | 3,137 | 2,470 | 2,648 |
| Total* |        |          | 0,926 |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+

\* Categories are intended to illustrate the variation in percent
minority enrollment.

SOURCE: U.S. Department of Education, National Center for Education
Statistics, Schools and Staffing Survey, 2003-2004.

**Table 5D: Number of SSOCS eligible combined schools in the 2003-2004
SASS/CCD frame, by type of locale, enrollment size, and minority
status**

+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        |          |       | Pe    |       |       |       |
|        |        |          |       | rcent |       |       |       |
|        |        |          |       | min   |       |       |       |
|        |        |          |       | ority |       |       |       |
|        |        |          |       | en    |       |       |       |
|        |        |          |       | rollm |       |       |       |
|        |        |          |       | ent\* |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
| I      | Type   | En       | N     | Less  | 5 to  | 20 to | 50%   |
| nstruc |        | rollment | umber |       | 19%   | 49%   | or    |
| tional | of     |          | of    | than  |       |       |       |
|        | locale | size of  | sc    | 5%    |       |       | more  |
| level  |        | school   | hools |       |       |       |       |
|        |        |          | in    |       |       |       |       |
|        |        |          | frame |       |       |       |       |
|        |        |          | (row  |       |       |       |       |
|        |        |          | t     |       |       |       |       |
|        |        |          | otal) |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
| Co     | > City | Less     | 407   | 15    | 60    | 102   | 230   |
| mbined |        | than 300 |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 124   | 2     | 18    | 27    | 77    |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 143   | 3     | 23    | 30    | 87    |
|        |        | 999      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 143   | 2     | 26    | 36    | 79    |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | >      | Less     | 313   | 49    | 69    | 89    | 106   |
|        |  Urban | than 300 |       |       |       |       |       |
|        | >      |          |       |       |       |       |       |
|        | fringe |          |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 140   | 43    | 47    | 28    | 22    |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 259   | 77    | 81    | 65    | 36    |
|        |        | 999      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 189   | 28    | 53    | 58    | 50    |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | > Town | Less     | 167   | 26    | 41    | 67    | 33    |
|        |        | than 300 |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 162   | 63    | 30    | 32    | 37    |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 223   | 95    | 45    | 43    | 40    |
|        |        | 999      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 70    | 31    | 18    | 13    | 8     |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | >      | Less     | 2187  | 959   | 486   | 344   | 398   |
|        |  Rural | than 300 |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 1165  | 648   | 255   | 155   | 107   |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 852   | 458   | 198   | 124   | 72    |
|        |        | 999      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 139   | 64    | 35    | 31    | 9     |
+--------+--------+----------+-------+-------+-------+-------+-------+
| *      |        |          | 6,683 | 2,563 | 1,485 | 1,244 | 1,391 |
| Total* |        |          |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+

\* Categories are intended to illustrate the variation in percent
minority enrollment.

SOURCE: U.S. Department of Education, National Center for Education
Statistics, Schools and Staffing Survey, 2003-2004.

**Table 5E: Number of SSOCS eligible elementary schools in the 2003-2004
SASS/CCD frame, by type of locale, enrollment size, and region**

+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        |          |       | R     |       |       |       |
|        |        |          |       | egion |       |       |       |
|        |        |          |       | \*    |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
| I      | Type   | En       | N     | Nort  | Sout  | Ce    | West  |
| nstruc |        | rollment | umber | heast | heast | ntral |       |
| tional | of     |          | of    |       |       |       |       |
|        | locale | size of  | sc    |       |       |       |       |
| level  |        | school   | hools |       |       |       |       |
|        |        |          | in    |       |       |       |       |
|        |        |          | frame |       |       |       |       |
|        |        |          | (row  |       |       |       |       |
|        |        |          | t     |       |       |       |       |
|        |        |          | otal) |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
| Elem   | > City | Less     | 2,299 | 452   | 361   | 839   | 647   |
| entary |        | than 300 |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 5,029 | 817   | 991   | 1,545 | 1,676 |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 5,690 | 994   | 1,075 | 952   | 2,669 |
|        |        | 999      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 647   | 190   | 55    | 87    | 315   |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | >      | Less     | 2,422 | 828   | 307   | 797   | 490   |
|        |  Urban | than 300 |       |       |       |       |       |
|        | >      |          |       |       |       |       |       |
|        | fringe |          |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 6,423 | 2,000 | 745   | 1,960 | 1,718 |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 7,769 | 1,542 | 1,729 | 1,209 | 3,289 |
|        |        | 999      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 518   | 59    | 207   | 31    | 221   |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | > Town | Less     | 1,744 | 217   | 225   | 844   | 458   |
|        |        | than 300 |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 2,188 | 222   | 559   | 703   | 704   |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 1,243 | 116   | 556   | 226   | 345   |
|        |        | 999      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 32    | 1     | 26    | 3     | 2     |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | >      | Less     | 6,443 | 1,058 | 1,095 | 2,475 | 1,815 |
|        |  Rural | than 300 |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 3,817 | 692   | 1,161 | 1,154 | 810   |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 2,936 | 557   | 1,281 | 479   | 619   |
|        |        | 999      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 159   | 23    | 98    | 9     | 29    |
+--------+--------+----------+-------+-------+-------+-------+-------+
| *      |        |          | 4     | 9,768 | 1     | 1     | 1     |
| Total* |        |          | 9,359 |       | 0,471 | 3,313 | 5,807 |
+--------+--------+----------+-------+-------+-------+-------+-------+

\* Regions are the four regions defined for the National Assessment of
Educational Progress (NAEP). The northeast region consists of
Connecticut, District of Columbia, Delaware, Massachusetts, Maryland,
Maine, New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island,
and Vermont. The southeast region consists of Alabama, Arkansas,
Florida, Georgia, Kentucky, Louisiana, Mississippi, North Carolina,
South Carolina, Tennessee, Virginia, and West Virginia. The central
region consists of Iowa, Illinois, Indiana, Kansas, Michigan, Minnesota,
Missouri, North Dakota, Nebraska, Ohio, South Dakota, and Wisconsin. The
west region consists of Alaska, Arizona, California, Colorado, Hawaii,
Idaho, Montana, New Mexico, Nevada, Oklahoma, Oregon, Texas, Utah,
Washington, and Wyoming.

SOURCE: U.S. Department of Education, National Center for Education
Statistics, Schools and Staffing Survey, 2003-2004.

**Table 5F: Number of SSOCS eligible middle schools in the 2003-2004
SASS/CCD frame, by type of locale, enrollment size, and region**

+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        |          |       | R     |       |       |       |
|        |        |          |       | egion |       |       |       |
|        |        |          |       | \*    |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
| I      | Type   | En       | N     | Nort  | Sout  | Ce    | West  |
| nstruc |        | rollment | umber | heast | heast | ntral |       |
| tional | of     |          | of    |       |       |       |       |
|        | locale | size of  | sc    |       |       |       |       |
| level  |        | school   | hools |       |       |       |       |
|        |        |          | in    |       |       |       |       |
|        |        |          | frame |       |       |       |       |
|        |        |          | (row  |       |       |       |       |
|        |        |          | t     |       |       |       |       |
|        |        |          | otal) |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
| Middle | > City | Less     | 241   | 69    | 39    | 60    | 73    |
|        |        | than 300 |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 449   | 102   | 99    | 136   | 112   |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 1,999 | 299   | 482   | 468   | 750   |
|        |        | 999      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 725   | 154   | 149   | 40    | 382   |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | >      | Less     | 374   | 103   | 59    | 126   | 86    |
|        |  Urban | than 300 |       |       |       |       |       |
|        | >      |          |       |       |       |       |       |
|        | fringe |          |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 935   | 278   | 117   | 327   | 213   |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 3,016 | 801   | 511   | 783   | 921   |
|        |        | 999      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 1,135 | 227   | 325   | 119   | 464   |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | > Town | Less     | 467   | 30    | 86    | 167   | 184   |
|        |        | than 300 |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 834   | 66    | 237   | 270   | 261   |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 948   | 85    | 335   | 243   | 285   |
|        |        | 999      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 66    | 11    | 32    | 11    | 12    |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | >      | Less     | 1,149 | 102   | 155   | 432   | 460   |
|        |  Rural | than 300 |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 947   | 176   | 286   | 288   | 197   |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 1,107 | 257   | 427   | 235   | 188   |
|        |        | 999      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 252   | 65    | 127   | 15    | 45    |
+--------+--------+----------+-------+-------+-------+-------+-------+
| *      |        |          | 1     | 2,825 | 3,466 | 3,720 | 4,633 |
| Total* |        |          | 4,644 |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+

\* Regions are the four regions defined for the National Assessment of
Educational Progress (NAEP). The northeast region consists of
Connecticut, District of Columbia, Delaware, Massachusetts, Maryland,
Maine, New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island,
and Vermont. The southeast region consists of Alabama, Arkansas,
Florida, Georgia, Kentucky, Louisiana, Mississippi, North Carolina,
South Carolina, Tennessee, Virginia, and West Virginia. The central
region consists of Iowa, Illinois, Indiana, Kansas, Michigan, Minnesota,
Missouri, North Dakota, Nebraska, Ohio, South Dakota, and Wisconsin. The
west region consists of Alaska, Arizona, California, Colorado, Hawaii,
Idaho, Montana, New Mexico, Nevada, Oklahoma, Oregon, Texas, Utah,
Washington, and Wyoming.

SOURCE: U.S. Department of Education, National Center for Education
Statistics, Schools and Staffing Survey, 2003-2004.

**Table 5G: Number of SSOCS eligible secondary schools in the 2003-2004
SASS/CCD frame, by type of locale, enrollment size, and region**

+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        |          |       | R     |       |       |       |
|        |        |          |       | egion |       |       |       |
|        |        |          |       | \*    |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
| I      | Type   | En       | N     | Nort  | Sout  | Ce    | West  |
| nstruc |        | rollment | umber | heast | heast | ntral |       |
| tional | of     |          | of    |       |       |       |       |
|        | locale | size of  | sc    |       |       |       |       |
| level  |        | school   | hools |       |       |       |       |
|        |        |          | in    |       |       |       |       |
|        |        |          | frame |       |       |       |       |
|        |        |          | (row  |       |       |       |       |
|        |        |          | t     |       |       |       |       |
|        |        |          | otal) |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
| Sec    | > City | Less     | 283   | 54    | 37    | 77    | 115   |
| ondary |        | than 300 |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 114   | 40    | 19    | 28    | 27    |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 308   | 69    | 82    | 79    | 78    |
|        |        | 999      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 1,608 | 246   | 333   | 357   | 672   |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | >      | Less     | 209   | 30    | 33    | 39    | 107   |
|        |  Urban | than 300 |       |       |       |       |       |
|        | >      |          |       |       |       |       |       |
|        | fringe |          |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 231   | 70    | 28    | 80    | 53    |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 923   | 336   | 138   | 282   | 167   |
|        |        | 999      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 2,252 | 556   | 427   | 492   | 777   |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | > Town | Less     | 190   | 8     | 33    | 57    | 92    |
|        |        | than 300 |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 408   | 31    | 84    | 162   | 131   |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 776   | 98    | 233   | 246   | 199   |
|        |        | 999      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 439   | 39    | 141   | 127   | 132   |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | >      | Less     | 1,006 | 30    | 82    | 447   | 447   |
|        |  Rural | than 300 |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 744   | 105   | 179   | 295   | 165   |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 861   | 199   | 302   | 236   | 124   |
|        |        | 999      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 574   | 129   | 248   | 85    | 112   |
+--------+--------+----------+-------+-------+-------+-------+-------+
| *      |        |          | 1     | 2,040 | 2,399 | 3,089 | 3,398 |
| Total* |        |          | 0,926 |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+

\* Regions are the four regions defined for the National Assessment of
Educational Progress (NAEP). The northeast region consists of
Connecticut, District of Columbia, Delaware, Massachusetts, Maryland,
Maine, New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island,
and Vermont. The southeast region consists of Alabama, Arkansas,
Florida, Georgia, Kentucky, Louisiana, Mississippi, North Carolina,
South Carolina, Tennessee, Virginia, and West Virginia. The central
region consists of Iowa, Illinois, Indiana, Kansas, Michigan, Minnesota,
Missouri, North Dakota, Nebraska, Ohio, South Dakota, and Wisconsin. The
west region consists of Alaska, Arizona, California, Colorado, Hawaii,
Idaho, Montana, New Mexico, Nevada, Oklahoma, Oregon, Texas, Utah,
Washington, and Wyoming.

SOURCE: U.S. Department of Education, National Center for Education
Statistics, Schools and Staffing Survey, 2003-2004.

**Table 5H: Number of SSOCS eligible combined schools in the 2003-2004
SASS/CCD frame, by type of locale, enrollment size, and region**

+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        |          |       | R     |       |       |       |
|        |        |          |       | egion |       |       |       |
|        |        |          |       | \*    |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
| I      | Type   | En       | N     | Nort  | Sout  | Ce    | West  |
| nstruc |        | rollment | umber | heast | heast | ntral |       |
| tional | of     |          | of    |       |       |       |       |
|        | locale | size of  | sc    |       |       |       |       |
| level  |        | school   | hools |       |       |       |       |
|        |        |          | in    |       |       |       |       |
|        |        |          | frame |       |       |       |       |
|        |        |          | (row  |       |       |       |       |
|        |        |          | t     |       |       |       |       |
|        |        |          | otal) |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
| Co     | > City | Less     | 407   | 33    | 115   | 90    | 169   |
| mbined |        | than 300 |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 124   | 29    | 18    | 28    | 49    |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 143   | 28    | 48    | 37    | 30    |
|        |        | 999      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 143   | 26    | 51    | 29    | 37    |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | >      | Less     | 313   | 22    | 133   | 51    | 107   |
|        |  Urban | than 300 |       |       |       |       |       |
|        | >      |          |       |       |       |       |       |
|        | fringe |          |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 140   | 41    | 40    | 35    | 24    |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 259   | 115   | 55    | 57    | 32    |
|        |        | 999      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 189   | 39    | 69    | 36    | 45    |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | > Town | Less     | 167   | 4     | 51    | 32    | 80    |
|        |        | than 300 |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 162   | 18    | 57    | 53    | 34    |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 223   | 52    | 96    | 57    | 18    |
|        |        | 999      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 70    | 5     | 24    | 34    | 7     |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | >      | Less     | 2,187 | 88    | 254   | 854   | 991   |
|        |  Rural | than 300 |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 1,165 | 147   | 263   | 527   | 228   |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 852   | 151   | 299   | 306   | 96    |
|        |        | 999      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 139   | 15    | 59    | 45    | 20    |
+--------+--------+----------+-------+-------+-------+-------+-------+
| *      |        |          | 6,683 | 813   | 1,632 | 2,271 | 1,967 |
| Total* |        |          |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+

\* Regions are the four regions defined for the National Assessment of
Educational Progress (NAEP). The northeast region consists of
Connecticut, District of Columbia, Delaware, Massachusetts, Maryland,
Maine, New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island,
and Vermont. The southeast region consists of Alabama, Arkansas,
Florida, Georgia, Kentucky, Louisiana, Mississippi, North Carolina,
South Carolina, Tennessee, Virginia, and West Virginia. The central
region consists of Iowa, Illinois, Indiana, Kansas, Michigan, Minnesota,
Missouri, North Dakota, Nebraska, Ohio, South Dakota, and Wisconsin. The
west region consists of Alaska, Arizona, California, Colorado, Hawaii,
Idaho, Montana, New Mexico, Nevada, Oklahoma, Oregon, Texas, Utah,
Washington, and Wyoming.

SOURCE: U.S. Department of Education, National Center for Education
Statistics, Schools and Staffing Survey, 2003-2004.

# Sample Size. Similar to SSOCS:2004, SSOCS:2006 effective sample size will be 2,550 (completed surveys). Table 6 gives the estimates for some key variables based on the 2004 effective sample sizes and the standard errors of those estimates. Table 6 also gives the minimum detectable absolute differences in population percentages of schools reporting various categories of violence. These differences are between two time periods with 80% power and 70% power when a two-sided test at 5% level of significance is conducted and assuming the same sample sizes at both time periods 2004 and 2006. The percentage in 2004 and the actual sample size are also shown in the table. For power calculations, a design effect of 1.4 is assumed (this was the SSOCS:2004 overall design effect). Using this information, the detectable difference has been calculated in the table below (the difference is provided in percentage points).

Table 6: Standard Errors of the Estimates and Minimum Detectable
Difference Between SSOCS 2004 and SSOCS 2006 with 70% and 80% Power

+------------------------+-------+-----------+-----------+-----+-----+
| Category               | Perce | SSOCS     | SSOCS     | M   |     |
|                        | ntage | 2004      | 2004      | ini |     |
|                        | of    | Standard  | Sample    | mum |     |
|                        | SSOCS | Error     | Size      | D   |     |
|                        | 2004  |           |           | ete |     |
|                        | Sc    | (p        |           | cta |     |
|                        | hools | ercentage |           | ble |     |
|                        |       | points)   |           |     |     |
|                        |       |           |           | D   |     |
|                        |       |           |           | iff |     |
|                        |       |           |           | ere |     |
|                        |       |           |           | nce |     |
+------------------------+-------+-----------+-----------+-----+-----+
|                        |       |           |           | 80% | 70% |
|                        |       |           |           | Po  | Po  |
|                        |       |           |           | wer | wer |
+------------------------+-------+-----------+-----------+-----+-----+
| Total Violence         | 71%   | 1.4       | 2,272     | 4.6 | 4.1 |
+------------------------+-------+-----------+-----------+-----+-----+
| High School Violence   | 92%   | 1.4       | 768       | 5.3 | 4.6 |
+------------------------+-------+-----------+-----------+-----+-----+
| Middle School Violence | 87%   | 1.7       | 744       | 6.4 | 5.6 |
+------------------------+-------+-----------+-----------+-----+-----+
| Elementary School      | 61%   | 2.1       | 577       | 9.7 | 8.6 |
| Violence               |       |           |           |     |     |
+------------------------+-------+-----------+-----------+-----+-----+
| Serious Violence       | 20%   | 1.0       | 2,270     | 4.1 | 3.6 |
+------------------------+-------+-----------+-----------+-----+-----+
| High School Serious    | 29%   | 1.3       | 768       | 8.0 | 7.1 |
| Violence               |       |           |           |     |     |
+------------------------+-------+-----------+-----------+-----+-----+
| # Middle S             | 29%   | 1.9       | 744       | 8.1 | 7.2 |
| chool Serious Violence |       |           |           |     |     |
+------------------------+-------+-----------+-----------+-----+-----+
| Elementary School      | 14%   | 1.4       | 577       | 7.5 | 6.6 |
| Serious Violence       |       |           |           |     |     |
+------------------------+-------+-----------+-----------+-----+-----+

SOURCE: U.S. Department of Education, National Center for Education
Statistics, School Survey on Crime and Safety, 2000. Unpublished
estimates.

# While the standard errors associated with 2004 estimates are expected to be smaller (due to larger than expected sample sizes), the power to detect change over time (as described in table 6 above) will remain unchanged. This is because the power to detect differences is driven by the size of the smaller sample.

# 

# Summary of the Sampling Steps. The steps taken to draw the sample in 2004 will also be used in 2006. These steps are explained in some technical detail in the sections that follow, but a brief and non-technical outline of the steps described later in this sampling plan are described below:

1.  The sample sizes for each instructional level have been decided
    upon, based on discussions between NCES, ESSI, and Census regarding
    precision. The allocation was designed to permit a relatively
    detailed analysis of the three major instructional levels (primary,
    middle, high school) while also allowing for reasonably efficient
    overall estimates.

2.  The sample size for each instructional level will be allocated to
    the 16 subgroups formed by crossing locale with school size (this
    step will yield 64 strata total).

3.  The sample will then be allocated to the respective 16 strata within
    each instructional level based on a "measure of size" defined by the
    aggregate of the sum of the square roots of each school's enrollment
    size within each stratum. The result determines what proportion of
    the sample will be allocated to each stratum.

4.  Once the entire sample has been allocated, the file will be sorted
    within each stratum by percent minority and by region.

5.  After the file is sorted, a systematic sample will be drawn that
    allocates the necessary sample to each of the 64 strata.

# Stratification. As indicated earlier, the same variables and categories used in SSOCS:2004 are proposed for creating strata for sample selection in SSOCS:2006. The population of schools will be stratified by four instructional levels (as defined in table 3), four types of locale, and four enrollment size groups. 

**Allocation to school levels.** The total sample of 2,550 of schools
will be allocated to the four instructional levels, as defined in table
3, as follows: 640 primary schools, 895 middle schools, 915 high
schools, and 100 combined schools.

**School size and locale.** The sample of schools in each instructional
level can be allocated to each of the 16 subgroups[^7] formed by the
cross classification of four categories of enrollment size and four
types of locale[^8] (1) in proportion to the number of schools in each
subgroup, or (2) in proportion to the total enrollment in each subgroup.
Allocating in proportion to the number of schools would yield a small
sample of high enrollment schools because the distribution of schools by
enrollment is skewed, especially in the rural stratum. For example, as
shown on table 5A, 6,443 of the rural elementary schools have student
enrollments below 300, representing approximately 48 percent of all
rural elementary schools. This allocation may not be desirable. If the
sample were allocated in proportion to the total enrollment, it would
yield a small sample of low enrollment schools, which may also not be
desirable. For example, in table 4B Elementary schools with enrollments
under 300 represent 26 percent of all elementary schools, but represent
only 11 percent of the elementary student population.

**Allocation Scheme.** In order to get a reasonable sample of lower
enrollment schools and at the same time give a higher probability of
selection to higher enrollment schools, the sample will be allocated to
each subgroup in proportion to the sum of the square roots of the total
student enrollment in each school in that stratum. In this case, the sum
of the square roots will be called the "measure of size" or MOS. The MOS
is found by first finding the square root of each school's enrollment
and then aggregating across the strata within an instructional level.

The formula is given as:

> MOS(h) =
>
> where Ehi = the enrollment of the i ^th^ school in stratum h and Nh is
> the total number of schools in stratum h.

The measure of size for the instructional level -- MOS(l) - is found by
summing across the 16 measure of size values, MOS(h), that comprise the
instructional level. The ratio of the stratum's measure of size to the
overall measure of size for the instructional level determines the
number of cases to be allocated to that stratum. This is found by
dividing the stratum measure of size *MOS(h)* by the total measure of
size for the instructional level *MOS(l)*. The result provides the
proportion of the sample that should be allocated to this stratum.

Tables 7A through 7H summarize the aggregate of the square roots of
enrollment by sampling stratum. The current estimates in these tables
are based on the 2003--04 SASS sampling frame, but they are expected to
be similar to those based on the 2003--04 CCD. Similar to tables 4A
through 5H above, these tables will be updated with data from the
SSOCS:2006 frame when the proper adjustments are made to the 2003--04
CCD School Universe File to create the SSOCS:2006 sampling frame. Tables
7A through 7D also show the measure of size for schools by minority
enrollments and tables 7E through 7H show the measure of size by region.
These tables are provided to give an indication of how the sample will
be ultimately allocated based because the schools within each stratum
will be sorted by percent minority enrollment and by region.

**Table 7A: Aggregate measure of size of SSOCS eligible elementary
schools in the 2003-2004 SASS/CCD frame, by type of locale, enrollment
size, and minority status**

+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        |          |       | Aggr  |       |       |       |
|        |        |          |       | egate |       |       |       |
|        |        |          |       | of    |       |       |       |
|        |        |          |       | the   |       |       |       |
|        |        |          |       | s     |       |       |       |
|        |        |          |       | quare |       |       |       |
|        |        |          |       | roots |       |       |       |
|        |        |          |       | of    |       |       |       |
|        |        |          |       | s     |       |       |       |
|        |        |          |       | chool |       |       |       |
|        |        |          |       | enrol |       |       |       |
|        |        |          |       | lment |       |       |       |
|        |        |          |       | in    |       |       |       |
|        |        |          |       |       |       |       |       |
|        |        |          |       | each  |       |       |       |
|        |        |          |       | min   |       |       |       |
|        |        |          |       | ority |       |       |       |
|        |        |          |       | enrol |       |       |       |
|        |        |          |       | lment |       |       |       |
|        |        |          |       | subs  |       |       |       |
|        |        |          |       | trata |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
| I      | Type   | En       | Aggr  | Less  | 5 to  | 20 to | 50%   |
| nstruc |        | rollment | egate |       |       |       | or    |
| tional | of     |          | Me    | than  | 19.9% | 49.9% |       |
|        | locale | size of  | asure | 5% or |       |       | more  |
| Level  |        | school   | of    | mi    |       |       |       |
|        |        |          | size  | ssing |       |       |       |
|        |        |          | (row  |       |       |       |       |
|        |        |          |       |       |       |       |       |
|        |        |          | t     |       |       |       |       |
|        |        |          | otal) |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
| Elem   | > City | Less     | 3     | 1,170 | 6,420 | 7,911 | 1     |
| entary |        | than 300 | 3,707 |       |       |       | 8,206 |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 10    | 2,143 | 1     | 2     | 5     |
|        |        | 499      | 0,255 |       | 6,055 | 4,771 | 7,286 |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 14    | 1,127 | 1     | 3     | 10    |
|        |        | 999      | 6,776 |       | 4,427 | 0,081 | 1,141 |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 2     | 102   | 841   | 1,668 | 1     |
|        |        |          | 2,510 |       |       |       | 9,899 |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | >      | Less     | 3     | 7,639 | 1     | 7,819 | 6,343 |
|        |  Urban | than 300 | 4,907 |       | 3,106 |       |       |
|        | >      |          |       |       |       |       |       |
|        | fringe |          |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 12    | 1     | 4     | 3     | 2     |
|        |        | 499      | 9,335 | 9,224 | 4,688 | 5,452 | 9,971 |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 19    | 1     | 5     | 5     | 7     |
|        |        | 999      | 9,254 | 8,575 | 4,106 | 6,085 | 0,488 |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 1     | 716   | 2,581 | 3,595 | 1     |
|        |        |          | 7,734 |       |       |       | 0,842 |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | > Town | Less     | 2     | 6,906 | 9,072 | 4,864 | 3,721 |
|        |        | than 300 | 4,563 |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 4     | 9,196 | 1     | 9,860 | 9,477 |
|        |        | 499      | 3,223 |       | 4,690 |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 3     | 6,418 | 7,545 | 8,264 | 8,857 |
|        |        | 999      | 1,084 |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 1,113 | 99    | 263   | 248   | 503   |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | >      | Less     | 7     | 4     | 1     | 8,638 | 7,453 |
|        |  Rural | than 300 | 6,064 | 0,849 | 9,124 |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 7     | 3     | 2     | 1     | 7,632 |
|        |        | 499      | 5,575 | 1,980 | 3,695 | 2,268 |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 7     | 2     | 2     | 1     | 1     |
|        |        | 999      | 4,321 | 0,566 | 6,644 | 6,860 | 0,251 |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 5,444 | 890   | 1,473 | 2,085 | 996   |
+--------+--------+----------+-------+-------+-------+-------+-------+
| *      |        |          | 1,01  | 16    | 25    | 23    | 36    |
| Total* |        |          | 5,865 | 7,600 | 4,730 | 0,469 | 3,066 |
+--------+--------+----------+-------+-------+-------+-------+-------+

SOURCE: U.S. Department of Education, National Center for Education
Statistics, Schools and Staffing Survey, 2003-2004.

**Table 7B: Aggregate measure of size of SSOCS eligible middle schools
in the 2003-2004 SASS/CCD frame, by type of locale, enrollment size, and
minority status**

+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        |          |       | Aggr  |       |       |       |
|        |        |          |       | egate |       |       |       |
|        |        |          |       | of    |       |       |       |
|        |        |          |       | the   |       |       |       |
|        |        |          |       | s     |       |       |       |
|        |        |          |       | quare |       |       |       |
|        |        |          |       | roots |       |       |       |
|        |        |          |       | of    |       |       |       |
|        |        |          |       | s     |       |       |       |
|        |        |          |       | chool |       |       |       |
|        |        |          |       | enrol |       |       |       |
|        |        |          |       | lment |       |       |       |
|        |        |          |       | in    |       |       |       |
|        |        |          |       |       |       |       |       |
|        |        |          |       | each  |       |       |       |
|        |        |          |       | min   |       |       |       |
|        |        |          |       | ority |       |       |       |
|        |        |          |       | enrol |       |       |       |
|        |        |          |       | lment |       |       |       |
|        |        |          |       | subs  |       |       |       |
|        |        |          |       | trata |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
| I      | Type   | En       | Aggr  | Less  | 5 to  | 20 to | 50%   |
| nstruc |        | rollment | egate |       |       |       | or    |
| tional | of     |          | Me    | than  | 19.9% | 49.9% |       |
|        | locale | size of  | asure | 5%    |       |       | more  |
| Level  |        | school   | of    |       |       |       |       |
|        |        |          | size  |       |       |       |       |
|        |        |          | (row  |       |       |       |       |
|        |        |          |       |       |       |       |       |
|        |        |          | t     |       |       |       |       |
|        |        |          | otal) |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
| Middle | > City | Less     | 3,033 | 33    | 488   | 361   | 2,151 |
|        |        | than 300 |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 9,131 | 253   | 1,556 | 1,632 | 5,690 |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 5     | 677   | 9,269 | 1     | 3     |
|        |        | 999      | 4,220 |       |       | 3,855 | 0,419 |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 2     | 129   | 2,579 | 5,890 | 1     |
|        |        |          | 6,126 |       |       |       | 7,528 |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | >      | Less     | 5,266 | 1,409 | 1,387 | 1,098 | 1,372 |
|        |  Urban | than 300 |       |       |       |       |       |
|        | >      |          |       |       |       |       |       |
|        | fringe |          |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 1     | 5,322 | 6,158 | 4,569 | 2,806 |
|        |        | 499      | 8,855 |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 8     | 1     | 3     | 2     | 1     |
|        |        | 999      | 1,289 | 1,781 | 0,490 | 1,876 | 7,142 |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 4     | 2,289 | 9,836 | 1     | 1     |
|        |        |          | 0,303 |       |       | 2,916 | 5,262 |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | > Town | Less     | 6,839 | 2,073 | 1,859 | 1,478 | 1,429 |
|        |        | than 300 |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 1     | 4,323 | 5,271 | 3,808 | 3,214 |
|        |        | 499      | 6,616 |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 2     | 4,615 | 8,235 | 6,182 | 5,424 |
|        |        | 999      | 4,456 |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 2,253 | 299   | 664   | 775   | 515   |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | >      | Less     | 1     | 6,787 | 4,252 | 2,538 | 1,864 |
|        |  Rural | than 300 | 5,441 |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 1     | 8,871 | 5,059 | 2,677 | 2,152 |
|        |        | 499      | 8,759 |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 2     | 8,937 | 1     | 6,262 | 2,892 |
|        |        | 999      | 8,938 |       | 0,847 |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 8,850 | 1,546 | 3,256 | 2,761 | 1,287 |
+--------+--------+----------+-------+-------+-------+-------+-------+
| *      |        |          | 36    | 5     | 10    | 8     | 11    |
| Total* |        |          | 0,375 | 9,344 | 1,206 | 8,678 | 1,147 |
+--------+--------+----------+-------+-------+-------+-------+-------+

SOURCE: U.S. Department of Education, National Center for Education
Statistics, Schools and Staffing Survey, 2003-2004.

**Table 7C: Aggregate measure of size of SSOCS eligible secondary
schools in the 2003-2004 SASS/CCD frame, by type of locale, enrollment
size, and minority status**

+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        |          |       | Aggr  |       |       |       |
|        |        |          |       | egate |       |       |       |
|        |        |          |       | of    |       |       |       |
|        |        |          |       | the   |       |       |       |
|        |        |          |       | s     |       |       |       |
|        |        |          |       | quare |       |       |       |
|        |        |          |       | roots |       |       |       |
|        |        |          |       | of    |       |       |       |
|        |        |          |       | s     |       |       |       |
|        |        |          |       | chool |       |       |       |
|        |        |          |       | enrol |       |       |       |
|        |        |          |       | lment |       |       |       |
|        |        |          |       | in    |       |       |       |
|        |        |          |       |       |       |       |       |
|        |        |          |       | each  |       |       |       |
|        |        |          |       | min   |       |       |       |
|        |        |          |       | ority |       |       |       |
|        |        |          |       | enrol |       |       |       |
|        |        |          |       | lment |       |       |       |
|        |        |          |       | subs  |       |       |       |
|        |        |          |       | trata |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
| I      | Type   | En       | Aggr  | Less  | 5 to  | 20 to | 50%   |
| nstruc |        | rollment | egate |       |       |       | or    |
| tional | of     |          | Me    | than  | 19.9% | 49.9% |       |
|        | locale | size of  | asure | 5%    |       |       | more  |
| Level  |        | school   | of    |       |       |       |       |
|        |        |          | size  |       |       |       |       |
|        |        |          | (row  |       |       |       |       |
|        |        |          |       |       |       |       |       |
|        |        |          | t     |       |       |       |       |
|        |        |          | otal) |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
| Sec    | > City | Less     | 2,997 | 83    | 305   | 592   | 2,017 |
| ondary |        | than 300 |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 2,257 | 61    | 238   | 328   | 1,630 |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 8,529 | 115   | 1,113 | 1,558 | 5,743 |
|        |        | 999      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 6     | 844   | 1     | 1     | 3     |
|        |        |          | 8,062 |       | 1,678 | 8,999 | 6,541 |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | >      | Less     | 2,390 | 343   | 592   | 651   | 804   |
|        |  Urban | than 300 |       |       |       |       |       |
|        | >      |          |       |       |       |       |       |
|        | fringe |          |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 4,649 | 1,585 | 1,436 | 1,012 | 616   |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 2     | 8,115 | 8,919 | 5,322 | 2,975 |
|        |        | 999      | 5,331 |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 9     | 9,332 | 3     | 2     | 2     |
|        |        |          | 2,899 |       | 0,815 | 9,354 | 3,398 |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | > Town | Less     | 2,437 | 633   | 695   | 629   | 480   |
|        |        | than 300 |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 8,152 | 3,079 | 2,310 | 1,562 | 1,201 |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 2     | 7,413 | 7,004 | 3,730 | 2,541 |
|        |        | 999      | 0,688 |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 1     | 2,782 | 6,212 | 4,238 | 2,771 |
|        |        |          | 6,003 |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | >      | Less     | 1     | 6,140 | 3,362 | 2,135 | 1,357 |
|        |  Rural | than 300 | 2,994 |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 1     | 8,177 | 3,495 | 1,563 | 1,454 |
|        |        | 499      | 4,689 |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 2     | 1     | 6,651 | 3,230 | 1,760 |
|        |        | 999      | 2,845 | 1,204 |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 2     | 4,459 | 9,316 | 5,902 | 2,676 |
|        |        |          | 2,353 |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
| *      |        |          | 32    | 6     | 9     | 8     | 8     |
| Total* |        |          | 7,275 | 4,365 | 4,141 | 0,805 | 7,964 |
+--------+--------+----------+-------+-------+-------+-------+-------+

SOURCE: U.S. Department of Education, National Center for Education
Statistics, Schools and Staffing Survey, 2003-2004.

**Table 7D: Aggregate measure of size of SSOCS eligible combined schools
in the 2003-2004 SASS/CCD frame, by type of locale, enrollment size, and
minority status**

+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        |          |       | Aggr  |       |       |       |
|        |        |          |       | egate |       |       |       |
|        |        |          |       | of    |       |       |       |
|        |        |          |       | the   |       |       |       |
|        |        |          |       | s     |       |       |       |
|        |        |          |       | quare |       |       |       |
|        |        |          |       | roots |       |       |       |
|        |        |          |       | of    |       |       |       |
|        |        |          |       | s     |       |       |       |
|        |        |          |       | chool |       |       |       |
|        |        |          |       | enrol |       |       |       |
|        |        |          |       | lment |       |       |       |
|        |        |          |       | in    |       |       |       |
|        |        |          |       |       |       |       |       |
|        |        |          |       | each  |       |       |       |
|        |        |          |       | min   |       |       |       |
|        |        |          |       | ority |       |       |       |
|        |        |          |       | enrol |       |       |       |
|        |        |          |       | lment |       |       |       |
|        |        |          |       | subs  |       |       |       |
|        |        |          |       | trata |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
| I      | Type   | En       | Aggr  | Less  | 5 to  | 20 to | 50%   |
| nstruc |        | rollment | egate |       |       |       | or    |
| tional | of     |          | Me    | than  | 19.9% | 49.9% |       |
|        | locale | size of  | asure | 5%    |       |       | more  |
| Level  |        | school   | of    |       |       |       |       |
|        |        |          | size  |       |       |       |       |
|        |        |          | (row  |       |       |       |       |
|        |        |          |       |       |       |       |       |
|        |        |          | t     |       |       |       |       |
|        |        |          | otal) |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
| Co     | > City | Less     | 3,939 | 115   | 651   | 937   | 2,236 |
| mbined |        | than 300 |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 2,461 | 38    | 362   | 525   | 1,536 |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 3,847 | 71    | 618   | 819   | 2,339 |
|        |        | 999      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 5,732 | 81    | 1,033 | 1,429 | 3,189 |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | >      | Less     | 3,057 | 533   | 692   | 850   | 982   |
|        |  Urban | than 300 |       |       |       |       |       |
|        | >      |          |       |       |       |       |       |
|        | fringe |          |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 2,824 | 862   | 947   | 564   | 451   |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 6,894 | 2,059 | 2,141 | 1,738 | 956   |
|        |        | 999      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 7,662 | 1,071 | 2,082 | 2,374 | 2,135 |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | > Town | Less     | 1,578 | 251   | 402   | 614   | 311   |
|        |        | than 300 |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 3,222 | 1,266 | 602   | 623   | 731   |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 5,808 | 2,473 | 1,158 | 1,102 | 1,075 |
|        |        | 999      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 2,599 | 1,112 | 695   | 499   | 293   |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | >      | Less     | 2     | 1     | 6,247 | 4,288 | 4,306 |
|        |  Rural | than 300 | 7,575 | 2,734 |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 2     | 1     | 4,964 | 3,055 | 2,110 |
|        |        | 499      | 2,912 | 2,783 |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 2     | 1     | 5,080 | 3,204 | 1,848 |
|        |        | 999      | 1,890 | 1,758 |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 5,084 | 2,303 | 1,282 | 1,119 | 380   |
+--------+--------+----------+-------+-------+-------+-------+-------+
| *      |        |          | 12    | 4     | 2     | 2     | 2     |
| Total* |        |          | 7,084 | 9,510 | 8,956 | 3,740 | 4,878 |
+--------+--------+----------+-------+-------+-------+-------+-------+

SOURCE: U.S. Department of Education, National Center for Education
Statistics, Schools and Staffing Survey, 2003-2004.

**Table 7E: Aggregate measure of size of SSOCS eligible elementary
schools in the 2003-2004 SASS/CCD frame, by type of locale, enrollment
size, and region**

+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        |          |       | Aggr  |       |       |       |
|        |        |          |       | egate |       |       |       |
|        |        |          |       | of    |       |       |       |
|        |        |          |       | the   |       |       |       |
|        |        |          |       | s     |       |       |       |
|        |        |          |       | quare |       |       |       |
|        |        |          |       | roots |       |       |       |
|        |        |          |       | of    |       |       |       |
|        |        |          |       | s     |       |       |       |
|        |        |          |       | chool |       |       |       |
|        |        |          |       | enrol |       |       |       |
|        |        |          |       | lment |       |       |       |
|        |        |          |       | in    |       |       |       |
|        |        |          |       | each  |       |       |       |
|        |        |          |       | r     |       |       |       |
|        |        |          |       | egion |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
| I      | Type   | En       | Aggr  | Nort  | Sout  | Ce    | West  |
| nstruc |        | rollment | egate | heast | heast | ntral |       |
| tional | of     |          | Me    |       |       |       |       |
|        | locale | size of  | asure |       |       |       |       |
| Level  |        | school   | of    |       |       |       |       |
|        |        |          | size  |       |       |       |       |
|        |        |          | (row  |       |       |       |       |
|        |        |          |       |       |       |       |       |
|        |        |          | t     |       |       |       |       |
|        |        |          | otal) |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
| Elem   | > City | Less     | 3     | 6,659 | 5,324 | 1     | 9,171 |
| entary |        | than 300 | 3,706 |       |       | 2,552 |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 10    | 1     | 1     | 3     | 3     |
|        |        | 499      | 0,254 | 6,312 | 9,825 | 0,435 | 3,682 |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 14    | 2     | 2     | 2     | 6     |
|        |        | 999      | 6,778 | 5,836 | 7,305 | 4,105 | 9,532 |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 2     | 6,682 | 1,884 | 3,070 | 1     |
|        |        |          | 2,509 |       |       |       | 0,873 |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | >      | Less     | 3     | 1     | 4,371 | 1     | 6,222 |
|        |  Urban | than 300 | 4,907 | 2,334 |       | 1,980 |       |
|        | >      |          |       |       |       |       |       |
|        | fringe |          |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 12    | 4     | 1     | 3     | 3     |
|        |        | 499      | 9,334 | 0,050 | 5,134 | 9,136 | 5,014 |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 19    | 3     | 4     | 2     | 8     |
|        |        | 999      | 9,255 | 8,652 | 5,403 | 9,930 | 5,270 |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 1     | 2,009 | 7,072 | 1,088 | 7,565 |
|        |        |          | 7,734 |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | > Town | Less     | 2     | 2,999 | 3,326 | 1     | 6,317 |
|        |        | than 300 | 4,563 |       |       | 1,921 |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 4     | 4,358 | 1     | 1     | 1     |
|        |        | 499      | 3,223 |       | 1,218 | 3,694 | 3,953 |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 3     | 2,897 | 1     | 5,630 | 8,447 |
|        |        | 999      | 1,084 |       | 4,110 |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 1,113 | 36    | 913   | 98    | 66    |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | >      | Less     | 7     | 1     | 1     | 2     | 1     |
|        |  Rural | than 300 | 6,064 | 3,137 | 5,189 | 8,100 | 9,638 |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 7     | 1     | 2     | 2     | 1     |
|        |        | 499      | 5,574 | 3,744 | 3,189 | 2,611 | 6,030 |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 7     | 1     | 3     | 1     | 1     |
|        |        | 999      | 4,320 | 3,950 | 2,827 | 1,885 | 5,658 |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 5,445 | 774   | 3370  | 322   | 979   |
+--------+--------+----------+-------+-------+-------+-------+-------+
| *      |        |          | 1,01  | 20    | 23    | 24    | 33    |
| Total* |        |          | 5,863 | 0,429 | 0,460 | 6,577 | 8,417 |
+--------+--------+----------+-------+-------+-------+-------+-------+

SOURCE: U.S. Department of Education, National Center for Education
Statistics, Schools and Staffing Survey, 2003-2004.

**Table 7F: Aggregate measure of size of SSOCS eligible middle schools
in the 2003-2004 SASS/CCD frame, by type of locale, enrollment size, and
region**

+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        |          |       | Aggr  |       |       |       |
|        |        |          |       | egate |       |       |       |
|        |        |          |       | of    |       |       |       |
|        |        |          |       | the   |       |       |       |
|        |        |          |       | s     |       |       |       |
|        |        |          |       | quare |       |       |       |
|        |        |          |       | roots |       |       |       |
|        |        |          |       | of    |       |       |       |
|        |        |          |       | s     |       |       |       |
|        |        |          |       | chool |       |       |       |
|        |        |          |       | enrol |       |       |       |
|        |        |          |       | lment |       |       |       |
|        |        |          |       | in    |       |       |       |
|        |        |          |       | each  |       |       |       |
|        |        |          |       | r     |       |       |       |
|        |        |          |       | egion |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
| I      | Type   | En       | Aggr  | Nort  | Sout  | Ce    | West  |
| nstruc |        | rollment | egate | heast | heast | ntral |       |
| tional | of     |          | Me    |       |       |       |       |
|        | locale | size of  | asure |       |       |       |       |
| Level  |        | school   | of    |       |       |       |       |
|        |        |          | size  |       |       |       |       |
|        |        |          | (row  |       |       |       |       |
|        |        |          |       |       |       |       |       |
|        |        |          | t     |       |       |       |       |
|        |        |          | otal) |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
| Middle | > City | Less     | 3,033 | 917   | 520   | 751   | 845   |
|        |        | than 300 |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 9,131 | 2,020 | 2,004 | 2,794 | 2,313 |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 5     | 8,055 | 1     | 1     | 2     |
|        |        | 999      | 4,219 |       | 2,928 | 2,487 | 0,749 |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 2     | 5,524 | 5,213 | 1,354 | 1     |
|        |        |          | 6,127 |       |       |       | 4,036 |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | >      | Less     | 5,265 | 1,501 | 819   | 1,832 | 1,113 |
|        |  Urban | than 300 |       |       |       |       |       |
|        | >      |          |       |       |       |       |       |
|        | fringe |          |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 1     | 5,573 | 2,390 | 6,587 | 4,306 |
|        |        | 499      | 8,856 |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 8     | 2     | 1     | 2     | 2     |
|        |        | 999      | 1,288 | 1,589 | 3,803 | 0,809 | 5,087 |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 4     | 7,894 | 1     | 4,103 | 1     |
|        |        |          | 0,302 |       | 1,784 |       | 6,521 |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | > Town | Less     | 6,839 | 453   | 1,323 | 2,414 | 2,649 |
|        |        | than 300 |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 1     | 1,304 | 4,763 | 5,363 | 5,186 |
|        |        | 499      | 6,616 |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 2     | 2,194 | 8,705 | 6,203 | 7,355 |
|        |        | 999      | 4,457 |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 2,253 | 389   | 1,068 | 382   | 414   |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | >      | Less     | 1     | 1,493 | 2,262 | 5,807 | 5,878 |
|        |  Rural | than 300 | 5,440 |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 1     | 3,549 | 5,681 | 5,646 | 3,885 |
|        |        | 499      | 8,761 |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 2     | 6,696 | 1     | 6,067 | 4,907 |
|        |        | 999      | 8,939 |       | 1,269 |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 8,849 | 2,240 | 4,489 | 512   | 1,608 |
+--------+--------+----------+-------+-------+-------+-------+-------+
| *      |        |          | 36    | 7     | 8     | 8     | 11    |
| Total* |        |          | 0,375 | 1,391 | 9,021 | 3,111 | 6,852 |
+--------+--------+----------+-------+-------+-------+-------+-------+

SOURCE: U.S. Department of Education, National Center for Education
Statistics, Schools and Staffing Survey, 2003-2004.

**Table 7G: Aggregate measure of size of SSOCS eligible secondary
schools in the 2003-2004 SASS/CCD frame, by type of locale, enrollment
size, and region**

+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        |          |       | Aggr  |       |       |       |
|        |        |          |       | egate |       |       |       |
|        |        |          |       | of    |       |       |       |
|        |        |          |       | the   |       |       |       |
|        |        |          |       | s     |       |       |       |
|        |        |          |       | quare |       |       |       |
|        |        |          |       | roots |       |       |       |
|        |        |          |       | of    |       |       |       |
|        |        |          |       | s     |       |       |       |
|        |        |          |       | chool |       |       |       |
|        |        |          |       | enrol |       |       |       |
|        |        |          |       | lment |       |       |       |
|        |        |          |       | in    |       |       |       |
|        |        |          |       | each  |       |       |       |
|        |        |          |       | r     |       |       |       |
|        |        |          |       | egion |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
| I      | Type   | En       | Aggr  | Nort  | Sout  | Ce    | West  |
| nstruc |        | rollment | egate | heast | heast | ntral |       |
| tional | of     |          | Me    |       |       |       |       |
|        | locale | size of  | asure |       |       |       |       |
| Level  |        | school   | of    |       |       |       |       |
|        |        |          | size  |       |       |       |       |
|        |        |          | (row  |       |       |       |       |
|        |        |          |       |       |       |       |       |
|        |        |          | t     |       |       |       |       |
|        |        |          | otal) |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
| Sec    | > City | Less     | 2,996 | 675   | 354   | 844   | 1,123 |
| ondary |        | than 300 |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 2,257 | 793   | 375   | 555   | 534   |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 8,529 | 1,850 | 2,281 | 2,211 | 2,187 |
|        |        | 999      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 6     | 1     | 1     | 1     | 2     |
|        |        |          | 8,062 | 0,626 | 3,135 | 4,337 | 9,964 |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | >      | Less     | 2,390 | 377   | 353   | 480   | 1,180 |
|        |  Urban | than 300 |       |       |       |       |       |
|        | >      |          |       |       |       |       |       |
|        | fringe |          |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 4,648 | 1,426 | 546   | 1,607 | 1,069 |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 2     | 9,300 | 3,831 | 7,645 | 4,556 |
|        |        | 999      | 5,332 |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 9     | 2     | 1     | 1     | 3     |
|        |        |          | 2,900 | 1,439 | 7,763 | 9,804 | 3,894 |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | > Town | Less     | 2,437 | 95    | 355   | 805   | 1,182 |
|        |        | than 300 |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 8,152 | 642   | 1,683 | 3,222 | 2,605 |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 2     | 2,620 | 6,305 | 6,482 | 5,280 |
|        |        | 999      | 0,687 |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 1     | 1,385 | 5,088 | 4,583 | 4,948 |
|        |        |          | 6,004 |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | >      | Less     | 1     | 421   | 1,061 | 5,977 | 5,533 |
|        |  Rural | than 300 | 2,992 |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 1     | 2,092 | 3,560 | 5,819 | 3,219 |
|        |        | 499      | 4,690 |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 2     | 5,363 | 8,090 | 6,122 | 3,271 |
|        |        | 999      | 2,846 |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 2     | 4,818 | 9,652 | 3,268 | 4,615 |
|        |        |          | 2,353 |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
| *      |        |          | 32    | 6     | 7     | 8     | 10    |
| Total* |        |          | 7,275 | 3,922 | 4,432 | 3,761 | 5,160 |
+--------+--------+----------+-------+-------+-------+-------+-------+

SOURCE: U.S. Department of Education, National Center for Education
Statistics, Schools and Staffing Survey, 2003-2004.

**Table 7H: Aggregate measure of size of SSOCS eligible combined schools
in the 2003-2004 SASS/CCD frame, by type of locale, enrollment size, and
region**

+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        |          |       | Aggr  |       |       |       |
|        |        |          |       | egate |       |       |       |
|        |        |          |       | of    |       |       |       |
|        |        |          |       | the   |       |       |       |
|        |        |          |       | s     |       |       |       |
|        |        |          |       | quare |       |       |       |
|        |        |          |       | roots |       |       |       |
|        |        |          |       | of    |       |       |       |
|        |        |          |       | s     |       |       |       |
|        |        |          |       | chool |       |       |       |
|        |        |          |       | enrol |       |       |       |
|        |        |          |       | lment |       |       |       |
|        |        |          |       | in    |       |       |       |
|        |        |          |       | each  |       |       |       |
|        |        |          |       | r     |       |       |       |
|        |        |          |       | egion |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
| I      | Type   | En       | Aggr  | Nort  | Sout  | Ce    | West  |
| nstruc |        | rollment | egate | heast | heast | ntral |       |
| tional | of     |          | Me    |       |       |       |       |
|        | locale | size of  | asure |       |       |       |       |
| Level  |        | school   | of    |       |       |       |       |
|        |        |          | size  |       |       |       |       |
|        |        |          | (row  |       |       |       |       |
|        |        |          |       |       |       |       |       |
|        |        |          | t     |       |       |       |       |
|        |        |          | otal) |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
| Co     | > City | Less     | 3,938 | 398   | 908   | 917   | 1,715 |
| mbined |        | than 300 |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 2,460 | 594   | 354   | 559   | 953   |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 3,848 | 749   | 1,314 | 992   | 793   |
|        |        | 999      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 5,732 | 1,026 | 2,007 | 1,139 | 1,560 |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | >      | Less     | 3,057 | 249   | 1,142 | 572   | 1,094 |
|        |  Urban | than 300 |       |       |       |       |       |
|        | >      |          |       |       |       |       |       |
|        | fringe |          |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 2,824 | 838   | 802   | 699   | 485   |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 6,893 | 3,075 | 1,472 | 1,502 | 844   |
|        |        | 999      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 7,662 | 1,422 | 2,935 | 1,425 | 1,880 |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | > Town | Less     | 1,578 | 58    | 469   | 300   | 751   |
|        |        | than 300 |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 3,222 | 361   | 1,135 | 1,066 | 660   |
|        |        | 499      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 5,808 | 1,340 | 2,508 | 1,487 | 473   |
|        |        | 999      |       |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 2,598 | 168   | 912   | 1,274 | 244   |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        | >      | Less     | 2     | 1,256 | 3,115 | 1     | 1     |
|        |  Rural | than 300 | 7,577 |       |       | 1,512 | 1,694 |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 300 to   | 2     | 2,932 | 5,247 | 1     | 4,415 |
|        |        | 499      | 2,913 |       |       | 0,319 |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 500 to   | 2     | 3,842 | 7,699 | 7,844 | 2,505 |
|        |        | 999      | 1,890 |       |       |       |       |
+--------+--------+----------+-------+-------+-------+-------+-------+
|        |        | 1,000+   | 5,084 | 525   | 2,152 | 1,638 | 769   |
+--------+--------+----------+-------+-------+-------+-------+-------+
| *      |        |          | 12    | 1     | 3     | 4     | 3     |
| Total* |        |          | 7,084 | 8,833 | 4,171 | 3,245 | 0,835 |
+--------+--------+----------+-------+-------+-------+-------+-------+

SOURCE: U.S. Department of Education, National Center for Education
Statistics, Schools and Staffing Survey, 2003-2004.

**Sample Allocation.** The allocation of the instructional level sample
is determined by dividing each stratum measure of size (as provided in
tables 7A-7H) by the measure of size for the entire instructional level.
For example, as shown on table 7A, the measure of size for the stratum
of urban fringe elementary schools with between 500 to 999 students is
199,254. The measure of size across all 16 strata within the elementary
school level is 1,015,865. The ratio of this stratum to the overall
school level is 199,254 / 1,015,865 = .196142. This means we will
allocate about 19.6 percent of the 640 elementary school cases to this
stratum (specifically, 640 x .196142 = 125.53), or 126 schools. Note
that, due to rounding error, some strata are rounded up and some are
rounded down to the nearest whole integer.

**Response Rate Assumptions for SSOCS 2004.** Tables 8A -- 8D present
the sample allocation from each of the four instructional levels to each
of the 16 strata created by the cross-classification of locale and size
categories for SSOCS:2004. They show the sample size in terms of the
number of completes and the attempted sample size (i.e., the completion
rates, completed cases and sample size for SSOCS 2004 and those expected
for SSOCS 2006). Again, these tables will be updated with data from the
SSOCS:2006 frame when the proper adjustments are made to the 2003--04
CCD School Universe File to create the SSOCS:2006 sampling frame.

The actual response rates achieved in 2004 will be used as the
foundation for determining the number of schools that need to be
contacted in each stratum in 2006 so that the allocated number of
completes in each stratum is obtained. Tables 8A-8D includes a
comparison of completion rates (those achieved in 2004, and those
expected in 2006).

Table 8A: Completion rates, completed cases and sample size for
SSOCS:2004 and those expected for SSOCS:2006, elementary schools by
locale and school size.

+--------+----+--------+------+------+------+------+------+------+
| I      | Ty | Enro   | S    | S    | S    | S    | S    | S    |
| nstruc | pe | llment | SOCS | SOCS | SOCS | SOCS | SOCS | SOCS |
| tional | of | size   | 2004 | 2004 | 2004 | 2006 | 2006 | 2006 |
|        | lo | of     | C    | Sa   | C    | Expe | Ta   |      |
| level  | ca | school | ompl | mple | ompl | cted | rget | Sa   |
|        | le |        | etes | Draw | etes | C    | C    | mple |
|        |    |        |      |      | as a | ompl | ompl | Draw |
|        |    |        |      |      | per  | etes | etes |      |
|        |    |        |      |      | cent | as a |      |      |
|        |    |        |      |      | of   | per  |      |      |
|        |    |        |      |      | sam  | cent |      |      |
|        |    |        |      |      | pled | of   |      |      |
|        |    |        |      |      | c    | sam  |      |      |
|        |    |        |      |      | ases | pled |      |      |
|        |    |        |      |      |      | c    |      |      |
|        |    |        |      |      |      | ases |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    |        |      |      |      |      |      |      |
+--------+----+--------+------+------+------+------+------+------+
| **     | Ci | Less   | 19   | 31   | 6    | 7    | 21   | 28   |
| Elemen | ty | than   |      |      | 1.3% | 2.1% |      |      |
| tary** |    | 300    |      |      |      |      |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    | 300 to | 64   | 91   | 7    | 7    | 63   | 83   |
|        |    | 499    |      |      | 0.3% | 4.7% |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    | 500 to | 98   | 147  | 6    | 6    | 92   | 134  |
|        |    | 999    |      |      | 6.7% | 8.6% |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    | 1,000+ | 16   | 23   | 6    | 6    | 14   | 21   |
|        |    |        |      |      | 9.6% | 6.5% |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    |        |      |      |      |      |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        | U  | Less   | 25   | 32   | 7    | 7    | 22   | 29   |
|        | rb | than   |      |      | 8.1% | 4.4% |      |      |
|        | an | 300    |      |      |      |      |      |      |
|        | fr |        |      |      |      |      |      |      |
|        | in |        |      |      |      |      |      |      |
|        | ge |        |      |      |      |      |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    | 300 to | 85   | 124  | 6    | 7    | 81   | 113  |
|        |    | 499    |      |      | 8.5% | 0.6% |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    | 500 to | 128  | 189  | 6    | 7    | 126  | 172  |
|        |    | 999    |      |      | 7.7% | 2.3% |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    | 1,000+ | 10   | 14   | 7    | 8    | 11   | 13   |
|        |    |        |      |      | 1.4% | 5.0% |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    |        |      |      |      |      |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        | To | Less   | 16   | 19   | 8    | 8    | 15   | 17   |
|        | wn | than   |      |      | 4.2% | 5.7% |      |      |
|        |    | 300    |      |      |      |      |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    | 300 to | 40   | 44   | 9    | 6    | 27   | 40   |
|        |    | 499    |      |      | 0.9% | 7.1% |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    | 500 to | 19   | 25   | 7    | 8    | 20   | 23   |
|        |    | 999    |      |      | 6.0% | 7.9% |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    | 1,000+ | 0    | 1    | 0.0% | 10   | 1    | 1    |
|        |    |        |      |      |      | 0.0% |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    |        |      |      |      |      |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        | R  | Less   | 58   | 63   | 9    | 8    | 48   | 57   |
|        | ur | than   |      |      | 2.1% | 2.0% |      |      |
|        | al | 300    |      |      |      |      |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    | 300 to | 49   | 57   | 8    | 9    | 48   | 52   |
|        |    | 499    |      |      | 6.0% | 0.5% |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    | 500 to | 62   | 78   | 7    | 6    | 47   | 71   |
|        |    | 999    |      |      | 9.5% | 4.9% |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    | 1,000+ | 3    | 3    | 10   | 10   | 3    | 3    |
|        |    |        |      |      | 0.0% | 0.0% |      |      |
+--------+----+--------+------+------+------+------+------+------+
| *      |    |        | 692  | 941  | 7    | 7    | 640  | 870  |
| Total* |    |        |      |      | 3.5% | 3.6% |      |      |
+--------+----+--------+------+------+------+------+------+------+

SOURCE: U.S. Department of Education, National Center for Education
Statistics, School Survey on Crime and Safety, 2004.

Table 8B: Completion rates, completed cases and sample size for
SSOCS:2004 and those expected for SSOCS:2006, middle schools by locale
and school size.

+---------+----+--------+------+------+------+------+------+------+
| Instru  | Ty | Enro   | S    | S    | S    | S    | S    | S    |
| ctional | pe | llment | SOCS | SOCS | SOCS | SOCS | SOCS | SOCS |
|         | of | size   | 2004 | 2004 | 2004 | 2006 | 2006 | 2006 |
| level   | lo | of     | C    | Sa   | C    | Expe | Ta   |      |
|         | ca | school | ompl | mple | ompl | cted | rget | Sa   |
|         | le |        | etes | Draw | etes | C    | C    | mple |
|         |    |        |      |      | as a | ompl | ompl | Draw |
|         |    |        |      |      | per  | etes | etes |      |
|         |    |        |      |      | cent | as a |      |      |
|         |    |        |      |      | of   | per  |      |      |
|         |    |        |      |      | sam  | cent |      |      |
|         |    |        |      |      | pled | of   |      |      |
|         |    |        |      |      | c    | sam  |      |      |
|         |    |        |      |      | ases | pled |      |      |
|         |    |        |      |      |      | c    |      |      |
|         |    |        |      |      |      | ases |      |      |
+---------+----+--------+------+------+------+------+------+------+
|         |    |        |      |      |      |      |      |      |
+---------+----+--------+------+------+------+------+------+------+
| **M     | Ci | Less   | 11   | 12   | 9    | 6    | 8    | 12   |
| iddle** | ty | than   |      |      | 1.7% | 4.9% |      |      |
|         |    | 300    |      |      |      |      |      |      |
+---------+----+--------+------+------+------+------+------+------+
|         |    | 300 to | 26   | 38   | 6    | 6    | 23   | 35   |
|         |    | 499    |      |      | 8.4% | 4.9% |      |      |
+---------+----+--------+------+------+------+------+------+------+
|         |    | 500 to | 156  | 210  | 7    | 6    | 135  | 194  |
|         |    | 999    |      |      | 4.3% | 9.5% |      |      |
+---------+----+--------+------+------+------+------+------+------+
|         |    | 1,000+ | 75   | 108  | 6    | 6    | 65   | 100  |
|         |    |        |      |      | 9.4% | 4.9% |      |      |
+---------+----+--------+------+------+------+------+------+------+
|         |    |        |      |      |      |      |      |      |
+---------+----+--------+------+------+------+------+------+------+
|         | U  | Less   | 11   | 17   | 6    | 8    | 13   | 15   |
|         | rb | than   |      |      | 4.7% | 4.7% |      |      |
|         | an | 300    |      |      |      |      |      |      |
|         | fr |        |      |      |      |      |      |      |
|         | in |        |      |      |      |      |      |      |
|         | ge |        |      |      |      |      |      |      |
+---------+----+--------+------+------+------+------+------+------+
|         |    | 300 to | 45   | 62   | 7    | 8    | 47   | 57   |
|         |    | 499    |      |      | 2.6% | 1.6% |      |      |
+---------+----+--------+------+------+------+------+------+------+
|         |    | 500 to | 217  | 299  | 7    | 7    | 202  | 276  |
|         |    | 999    |      |      | 2.6% | 3.1% |      |      |
+---------+----+--------+------+------+------+------+------+------+
|         |    | 1,000+ | 113  | 167  | 6    | 6    | 100  | 154  |
|         |    |        |      |      | 7.7% | 4.9% |      |      |
+---------+----+--------+------+------+------+------+------+------+
|         |    |        |      |      |      |      |      |      |
+---------+----+--------+------+------+------+------+------+------+
|         | To | Less   | 19   | 24   | 7    | 7    | 17   | 22   |
|         | wn | than   |      |      | 9.2% | 6.8% |      |      |
|         |    | 300    |      |      |      |      |      |      |
+---------+----+--------+------+------+------+------+------+------+
|         |    | 300 to | 41   | 51   | 8    | 8    | 41   | 47   |
|         |    | 499    |      |      | 0.4% | 7.3% |      |      |
+---------+----+--------+------+------+------+------+------+------+
|         |    | 500 to | 57   | 73   | 7    | 9    | 61   | 67   |
|         |    | 999    |      |      | 8.1% | 0.6% |      |      |
+---------+----+--------+------+------+------+------+------+------+
|         |    | 1,000+ | 9    | 9    | 10   | 7    | 6    | 8    |
|         |    |        |      |      | 0.0% | 5.8% |      |      |
+---------+----+--------+------+------+------+------+------+------+
|         |    |        |      |      |      |      |      |      |
+---------+----+--------+------+------+------+------+------+------+
|         | R  | Less   | 38   | 48   | 7    | 8    | 38   | 45   |
|         | ur | than   |      |      | 9.2% | 5.7% |      |      |
|         | al | 300    |      |      |      |      |      |      |
+---------+----+--------+------+------+------+------+------+------+
|         |    | 300 to | 48   | 58   | 8    | 8    | 47   | 54   |
|         |    | 499    |      |      | 2.8% | 5.7% |      |      |
+---------+----+--------+------+------+------+------+------+------+
|         |    | 500 to | 74   | 102  | 7    | 7    | 72   | 94   |
|         |    | 999    |      |      | 2.5% | 6.6% |      |      |
+---------+----+--------+------+------+------+------+------+------+
|         |    | 1,000+ | 29   | 37   | 7    | 6    | 22   | 34   |
|         |    |        |      |      | 8.4% | 4.9% |      |      |
+---------+----+--------+------+------+------+------+------+------+
| *Total* |    |        | 969  | 1315 | 7    | 7    | 895  | 1215 |
|         |    |        |      |      | 3.7% | 3.7% |      |      |
+---------+----+--------+------+------+------+------+------+------+

SOURCE: U.S. Department of Education, National Center for Education
Statistics, School Survey on Crime and Safety, 2004.

Table 8C: Completion rates, completed cases and sample size for
SSOCS:2004 and those expected for SSOCS:2006, secondary schools by
locale and school size.

+--------+----+--------+------+------+------+------+------+------+
| I      | Ty | Enro   | S    | S    | S    | S    | S    | S    |
| nstruc | pe | llment | SOCS | SOCS | SOCS | SOCS | SOCS | SOCS |
| tional | of | size   | 2004 | 2004 | 2004 | 2006 | 2006 | 2006 |
|        | lo | of     | C    | Sa   | C    | Expe | Ta   |      |
| level  | ca | school | ompl | mple | ompl | cted | rget | Sa   |
|        | le |        | etes | Draw | etes | C    | C    | mple |
|        |    |        |      |      | as a | ompl | ompl | Draw |
|        |    |        |      |      | per  | etes | etes |      |
|        |    |        |      |      | cent | as a |      |      |
|        |    |        |      |      | of   | per  |      |      |
|        |    |        |      |      | sam  | cent |      |      |
|        |    |        |      |      | pled | of   |      |      |
|        |    |        |      |      | c    | sam  |      |      |
|        |    |        |      |      | ases | pled |      |      |
|        |    |        |      |      |      | c    |      |      |
|        |    |        |      |      |      | ases |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    |        |      |      |      |      |      |      |
+--------+----+--------+------+------+------+------+------+------+
| *      | Ci | Less   | 9    | 13   | 6    | 7    | 8    | 12   |
| *Secon | ty | than   |      |      | 9.2% | 0.1% |      |      |
| dary** |    | 300    |      |      |      |      |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    | 300 to | 9    | 10   | 9    | 6    | 6    | 9    |
|        |    | 499    |      |      | 0.0% | 8.9% |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    | 500 to | 28   | 39   | 7    | 6    | 24   | 36   |
|        |    | 999    |      |      | 1.8% | 7.2% |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    | 1,000+ | 206  | 316  | 6    | 6    | 190  | 287  |
|        |    |        |      |      | 5.2% | 6.4% |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    |        |      |      |      |      |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        | U  | Less   | 6    | 9    | 6    | 7    | 7    | 10   |
|        | rb | than   |      |      | 6.7% | 0.1% |      |      |
|        | an | 300    |      |      |      |      |      |      |
|        | fr |        |      |      |      |      |      |      |
|        | in |        |      |      |      |      |      |      |
|        | ge |        |      |      |      |      |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    | 300 to | 12   | 13   | 9    | 10   | 13   | 13   |
|        |    | 499    |      |      | 2.3% | 0.0% |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    | 500 to | 80   | 98   | 8    | 8    | 71   | 88   |
|        |    | 999    |      |      | 1.6% | 0.3% |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    | 1,000+ | 278  | 393  | 7    | 7    | 260  | 356  |
|        |    |        |      |      | 0.7% | 2.9% |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    |        |      |      |      |      |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        | To | Less   | 8    | 11   | 7    | 6    | 7    | 10   |
|        | wn | than   |      |      | 2.7% | 7.8% |      |      |
|        |    | 300    |      |      |      |      |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    | 300 to | 25   | 29   | 8    | 8    | 23   | 26   |
|        |    | 499    |      |      | 6.2% | 6.9% |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    | 500 to | 60   | 74   | 8    | 8    | 58   | 67   |
|        |    | 999    |      |      | 1.1% | 6.9% |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    | 1,000+ | 62   | 73   | 8    | 6    | 45   | 66   |
|        |    |        |      |      | 4.9% | 8.3% |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    |        |      |      |      |      |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        | R  | Less   | 42   | 46   | 9    | 8    | 36   | 42   |
|        | ur | than   |      |      | 1.3% | 7.0% |      |      |
|        | al | 300    |      |      |      |      |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    | 300 to | 45   | 49   | 9    | 9    | 41   | 44   |
|        |    | 499    |      |      | 1.8% | 2.3% |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    | 500 to | 66   | 88   | 7    | 8    | 64   | 79   |
|        |    | 999    |      |      | 5.0% | 0.5% |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    | 1,000+ | 73   | 101  | 7    | 6    | 62   | 91   |
|        |    |        |      |      | 2.3% | 8.5% |      |      |
+--------+----+--------+------+------+------+------+------+------+
| *      |    |        | 1009 | 1362 | 7    | 7    | 915  | 1235 |
| Total* |    |        |      |      | 4.1% | 4.1% |      |      |
+--------+----+--------+------+------+------+------+------+------+

SOURCE: U.S. Department of Education, National Center for Education
Statistics, School Survey on Crime and Safety, 2004.

Table 8D: Completion rates, completed cases and sample size for
SSOCS:2004 and those expected for SSOCS:2006, combined schools by locale
and school size.

+--------+----+--------+------+------+------+------+------+------+
| I      | Ty | Enro   | S    | S    | S    | S    | S    | S    |
| nstruc | pe | llment | SOCS | SOCS | SOCS | SOCS | SOCS | SOCS |
| tional | of | size   | 2004 | 2004 | 2004 | 2006 | 2006 | 2006 |
|        | lo | of     | C    | Sa   | C    | Expe | Ta   |      |
| level  | ca | school | ompl | mple | ompl | cted | rget | Sa   |
|        | le |        | etes | Draw | etes | C    | C    | mple |
|        |    |        |      |      | as a | ompl | ompl | Draw |
|        |    |        |      |      | per  | etes | etes |      |
|        |    |        |      |      | cent | as a |      |      |
|        |    |        |      |      | of   | per  |      |      |
|        |    |        |      |      | sam  | cent |      |      |
|        |    |        |      |      | pled | of   |      |      |
|        |    |        |      |      | c    | sam  |      |      |
|        |    |        |      |      | ases | pled |      |      |
|        |    |        |      |      |      | c    |      |      |
|        |    |        |      |      |      | ases |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    |        |      |      |      |      |      |      |
+--------+----+--------+------+------+------+------+------+------+
| **Comb | Ci | Less   | 3    | 4    | 7    | 6    | 3    | 4    |
| ined** | ty | than   |      |      | 5.0% | 7.8% |      |      |
|        |    | 300    |      |      |      |      |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    | 300 to | 1    | 2    | 5    | 10   | 2    | 2    |
|        |    | 499    |      |      | 0.0% | 0.0% |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    | 500 to | 3    | 4    | 7    | 7    | 3    | 4    |
|        |    | 999    |      |      | 5.0% | 6.2% |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    | 1,000+ | 4    | 8    | 5    | 6    | 5    | 7    |
|        |    |        |      |      | 0.0% | 1.0% |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    |        |      |      |      |      |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        | U  | Less   | 1    | 3    | 3    | 6    | 2    | 3    |
|        | rb | than   |      |      | 3.3% | 7.8% |      |      |
|        | an | 300    |      |      |      |      |      |      |
|        | fr |        |      |      |      |      |      |      |
|        | in |        |      |      |      |      |      |      |
|        | ge |        |      |      |      |      |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    | 300 to | 2    | 2    | 10   | 10   | 2    | 2    |
|        |    | 499    |      |      | 0.0% | 0.0% |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    | 500 to | 7    | 7    | 10   | 6    | 5    | 8    |
|        |    | 999    |      |      | 0.0% | 7.8% |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    | 1,000+ | 8    | 9    | 8    | 6    | 6    | 9    |
|        |    |        |      |      | 8.9% | 4.6% |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    |        |      |      |      |      |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        | To | Less   | 0    | 1    | 0.0% | 10   | 1    | 1    |
|        | wn | than   |      |      |      | 0.0% |      |      |
|        |    | 300    |      |      |      |      |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    | 300 to | 3    | 3    | 10   | 10   | 3    | 3    |
|        |    | 499    |      |      | 0.0% | 0.0% |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    | 500 to | 6    | 6    | 10   | 8    | 5    | 5    |
|        |    | 999    |      |      | 0.0% | 4.7% |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    | 1,000+ | 2    | 3    | 6    | 6    | 2    | 3    |
|        |    |        |      |      | 6.7% | 7.8% |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    |        |      |      |      |      |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        | R  | Less   | 25   | 28   | 8    | 7    | 22   | 26   |
|        | ur | than   |      |      | 9.3% | 8.7% |      |      |
|        | al | 300    |      |      |      |      |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    | 300 to | 14   | 18   | 7    | 10   | 18   | 18   |
|        |    | 499    |      |      | 7.8% | 0.0% |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    | 500 to | 18   | 21   | 8    | 8    | 17   | 21   |
|        |    | 999    |      |      | 5.7% | 1.3% |      |      |
+--------+----+--------+------+------+------+------+------+------+
|        |    | 1,000+ | 5    | 6    | 8    | 6    | 4    | 6    |
|        |    |        |      |      | 3.3% | 7.8% |      |      |
+--------+----+--------+------+------+------+------+------+------+
| *      |    |        | 102  | 125  | 8    | 8    | 100  | 123  |
| Total* |    |        |      |      | 1.6% | 1.3% |      |      |
+--------+----+--------+------+------+------+------+------+------+

SOURCE: U.S. Department of Education, National Center for Education
Statistics, School Survey on Crime and Safety, 2004.

Based on the sample allocation described here, 3,743 cases will be
selected from the sample frame, and we anticipate that 2,550 surveys
will be completed, for an unweighted completion rate of 68.1 percent.

Based on this allocation scheme, tables 9 and 10 provide the targeted
number of completes by locale and enrollment size. These tables will be
updated with data from the SSOCS:2006 frame when the proper adjustments
are made to the 2003--04 CCD School Universe File to create the
SSOCS:2006 sampling frame, and the sample is allocated.

# Table 9: Anticipated Sample Size by Locale for SSOCS:2006

  ----------------------- --------------------- --------------------------
  Locale                  Number of Schools in  Number of Schools in the
                          the Population        Sample (Target Completes)

  City                    20,209                662

  Urban Fringe            27,108                967

  Town                    9,957                 331

  Rural                   24,338                590

  Total                   81,612                2,550
  ----------------------- --------------------- --------------------------

**Table 10: Anticipated Sample Size by Enrollment Size for SSOCS:2006**

  ----------------------- --------------------- --------------------------
  Enrollment Size         Number of Schools in  Number of Schools in the
                          the Population        Sample (Target Completes)

  Under 300               19,901                269

  300 to 499              23,710                485

  500 to 999              29,053                1000

  1000+                   8,948                 796

  Total                   81,612                2,550
  ----------------------- --------------------- --------------------------

# Power for Cross-Sectional Comparisons. Based on this allocation scheme, estimates of the power available for cross-sectional comparisons can be calculated. Tables 11A through 11C provide the minimum detectable differences (in population percentages) of some school characteristics of interest, such as school violence, between various subgroups of schools. The tables provide information on the differences we can detect with 80% power and 70% power, assuming a two-sided statistical test at a 5% level of significance. For determining the differences in table 11A (school level), the example assumes a base population percentage characteristic of interest of 60% for elementary schools and 85% for middle schools, and an overall design effect of 1.4 to determine the minimum detectable difference. The differences in tables 11B and 11C are determined assuming a base percentage of 60%. 

# Table 11A: Minimum Detectable Differences between School Levels for SSOCS:2006

+--------------+------------+--------------+-------------+-----------+
| **Category** | **SSOCS    | **SSOCS 2006 | ## SSOCS 20 |           |
|              | 2004 Base  | target       | 06 expected |           |
|              | Percent of | completes in |             |           |
|              | schools    | Each Group** | ## Minimum  |           |
|              | reporting  |              |  Detectable |           |
|              | violence** |              |  Difference |           |
+--------------+------------+--------------+-------------+-----------+
|              |            |              | **80%       | **70%     |
|              |            |              | Power**     | Power**   |
+--------------+------------+--------------+-------------+-----------+
| Elementary   | 60%        | 640          | 8.2         | 7.3       |
| Schools vs.  |            |              | percentage  | p         |
| Middle       |            | 895          | points      | ercentage |
| Schools      |            |              |             | points    |
+--------------+------------+--------------+-------------+-----------+
| Elementary   | 60%        | 640          | 8.2         | 7.3       |
| Schools vs.  |            |              | percentage  | p         |
| Secondary    |            | 915          | points      | ercentage |
| Schools      |            |              |             | points    |
+--------------+------------+--------------+-------------+-----------+
| Middle       | 85%        | 895          | 4.8         | 4.3       |
| Schools vs.  |            |              | percentage  | p         |
|              |            | 915          | points      | ercentage |
| Secondary    |            |              |             | points    |
| Schools      |            |              |             |           |
+--------------+------------+--------------+-------------+-----------+

SOURCE: Base percents from U.S. Department of Education, National Center
for Education Statistics, School Survey on Crime and Safety, 2004.
Unpublished estimates.

# Table 11B: Minimum Detectable Differences between Various Locales for SSOCS:2006

+--------------+------------+--------------+------------+------------+
| **Category** | **SSOCS    | **SSOCS 2006 | ##         |            |
|              | 2004 Base  | target       |  SSOCS 200 |            |
|              | Percent of | completes in | 6 expected |            |
|              | schools    | Each Group** |            |            |
|              | reporting  |              | ##         |            |
|              | violence** |              |  Minimum D |            |
|              |            |              | etectable  |            |
|              |            |              | Difference |            |
+--------------+------------+--------------+------------+------------+
|              |            |              |            |            |
+--------------+------------+--------------+------------+------------+
|              |            |              | **80%      | **70%      |
|              |            |              | Power**    | Power**    |
+--------------+------------+--------------+------------+------------+
| City vs.     | 60%        | 662          | 8.1        | 7.2        |
| Urban Fringe |            |              | percentage | percentage |
|              |            | 967          | points     | points     |
+--------------+------------+--------------+------------+------------+
| City vs.     | 60%        | 662          | 10.7       | 9.6        |
| Town         |            |              | percentage | percentage |
|              |            | 331          | points     | points     |
+--------------+------------+--------------+------------+------------+
| City vs.     | 60%        | 662          | 9.0        | 8.0        |
| Rural        |            |              | percentage | percentage |
|              |            | 590          | points     | points     |
+--------------+------------+--------------+------------+------------+
| Urban Fringe | 60%        | 967          | 10.2       | 9.1        |
| vs. Town     |            |              | percentage | percentage |
|              |            | 331          | points     | points     |
+--------------+------------+--------------+------------+------------+
| Urban Fringe | 60%        | 967          | 8.4        | 7.5        |
| vs.          |            |              | percentage | percentage |
|              |            | 590          | points     | points     |
| Rural        |            |              |            |            |
+--------------+------------+--------------+------------+------------+
| Town vs.     | 60%        | 331          | 10.9       | 9.7        |
| Rural        |            |              | percentage | percentage |
|              |            | 590          | points     | points     |
+--------------+------------+--------------+------------+------------+

SOURCE: Base percents from U.S. Department of Education, National Center
for Education Statistics, School Survey on Crime and Safety, 2004.
Unpublished estimates.

# Table 11C: Minimum Detectable Differences between Schools with Various Student Enrollments for SSOCS:2006

+--------------+------------+---+------------+--------------+------------+
| **Category** | **SSOCS    |   | **SSOCS    | ## SSOCS 2   |            |
|              | 2004 Base  |   | 2006       | 006 expected |            |
|              | Percent of |   | target     |              |            |
|              | schools    |   | completes  | ## Minim     |            |
|              | reporting  |   | in Each    | um Detectabl |            |
|              | violence** |   | Group**    | e Difference |            |
+--------------+------------+---+------------+--------------+------------+
|              |            |   |            |              |            |
+--------------+------------+---+------------+--------------+------------+
|              |            |   |            | **80%        | **70%      |
|              |            |   |            | Power**      | Power**    |
+--------------+------------+---+------------+--------------+------------+
| Under 300    | 60%        | 2 |            | 12.0         | 10.6       |
| vs.          |            | 6 |            | percentage   | percentage |
|              |            | 6 |            | points       | points     |
| 300 to 499   |            |   |            |              |            |
|              |            | 4 |            |              |            |
|              |            | 8 |            |              |            |
|              |            | 5 |            |              |            |
+--------------+------------+---+------------+--------------+------------+
| Under 300    | 60%        | 2 |            | 10.8         | 9.6        |
| vs.          |            | 6 |            | percentage   | percentage |
|              |            | 6 |            | points       | points     |
| 500 to 999   |            |   |            |              |            |
|              |            | 1 |            |              |            |
|              |            | 0 |            |              |            |
|              |            | 0 |            |              |            |
|              |            | 3 |            |              |            |
+--------------+------------+---+------------+--------------+------------+
| Under 300 vs | 60%        | 2 |            | 11.1         | 9.9        |
| 1,000+       |            | 6 |            | percentage   | percentage |
|              |            | 6 |            | points       | points     |
|              |            |   |            |              |            |
|              |            | 7 |            |              |            |
|              |            | 9 |            |              |            |
|              |            | 6 |            |              |            |
+--------------+------------+---+------------+--------------+------------+
| 300 to 499   | 60%        | 4 |            | 8.8          | 7.8        |
| vs.          |            | 8 |            | percentage   | percentage |
|              |            | 5 |            | points       | points     |
| 500 to 999   |            |   |            |              |            |
|              |            | 1 |            |              |            |
|              |            | 0 |            |              |            |
|              |            | 0 |            |              |            |
|              |            | 3 |            |              |            |
+--------------+------------+---+------------+--------------+------------+
| 300 to 499   | 60%        | 4 |            | 9.2          | 8.1        |
| vs.          |            | 8 |            | percentage   | percentage |
|              |            | 5 |            | points       | points     |
| 1,000+       |            |   |            |              |            |
|              |            | 7 |            |              |            |
|              |            | 9 |            |              |            |
|              |            | 6 |            |              |            |
+--------------+------------+---+------------+--------------+------------+
| 500 to 599   | 60%        | 1 |            | 7.6          | 6.8        |
| vs.          |            | 0 |            | percentage   | percentage |
|              |            | 0 |            | points       | points     |
| 1,000+       |            | 3 |            |              |            |
|              |            |   |            |              |            |
|              |            | 7 |            |              |            |
|              |            | 9 |            |              |            |
|              |            | 6 |            |              |            |
+--------------+------------+---+------------+--------------+------------+

SOURCE: Base percents from U.S. Department of Education, National Center
for Education Statistics, School Survey on Crime and Safety, 2004.
Unpublished estimates.

#  

# Sample Selection

For the actual selection of the designated number of schools from the
population of schools in each of the 64 strata, systematic sampling will
be employed. First, the population of schools in each stratum will be
sorted by region and percent of minority student enrollment. The four
regions are the same as defined earlier. These are northeast, southeast,
central and west. Sorting by these variables before selection has the
same effect as stratification with proportional allocation of schools to
the strata. Systematic sampling will be used to select the exact number
of schools that is required in each stratum.

[^1]: The number of combined schools sampled in the SSOCS:2004 study was
    considerably smaller than in 2000. In SSOCS 2000, an initial sample
    of 269 combined schools was selected, and 199 surveys were
    completed. Because so few combined schools responded, reliable
    estimates for these schools could not be produced. It was therefore
    more efficient to take a smaller sample of combined schools and
    allocate the balance to the remaining three instructional for which
    separate estimates were required. In 2004, the number of completed
    surveys for combined schools was initially expected to be about half
    the size of combined school completes in 2000. This logic proved
    true, as 102 combined schools completed surveys in SSOCS:2004.

[^2]: Cell A included student enrollment in schools with less than 5
    percent minority enrollment or with missing information on minority
    enrollment; cell B included student enrollment in schools with
    between 5 percent and 19.9 percent minority enrollment; cell C
    student enrollment included schools with between 20 percent and 49.9
    percent minority enrollment; and cell D included student enrollment
    in schools with 50 percent or more minority enrollment.

[^3]: SSOCS Regions are the four regions defined for the National
    Assessment of Educational Progress (NAEP). These regions are defined
    as follows: The Northeast Region consists of: Connecticut, District
    of Columbia, Delaware, Massachusetts, Maryland, Maine, New
    Hampshire, New Jersey, New York, Pennsylvania, Rhode Island, and
    Vermont. The Southeast Region consists of: Alabama, Arkansas,
    Florida, Georgia, Kentucky, Louisiana, Mississippi, North Carolina,
    South Carolina, Tennessee, Virginia, and West Virginia. The Central
    Region consists of: Iowa, Illinois, Indiana, Kansas, Michigan,
    Minnesota, Missouri, North Dakota, Nebraska, Ohio, South Dakota, and
    Wisconsin. The West region consists of: Alaska, Arizona, California,
    Colorado, Hawaii, Idaho, Montana, New Mexico, Nevada, Oklahoma,
    Oregon, Texas, Utah, Washington, and Wyoming.

[^4]: While the SASS/CCD assigns schools to one of eight locales, the
    SSOCS 2006 sample will be allocated to four locale types. The locale
    variable in the SASS/CCD includes: Large City, Mid-size City, Urban
    Fringe of a Large City, Urban Fringe of a Mid-size City, Large Town,
    Small Town, Rural outside Metropolitan Statistical Area (MSA), and
    Rural inside an MSA. For allocation purposes, Census will combine:
    Large City and Mid-size City; Urban Fringe of a Large City and Urban
    Fringe of a Mid-size City; Large Town and Small Town; and Rural
    outside Metropolitan Statistical Area (MSA) and Rural inside an MSA.

[^5]: The already-calculated and categorized percent minority value will
    be imputed (rather than imputing each individual race category
    value). This is because in cases where minority enrollment is
    missing, it is missing for *all* of the race categories.

[^6]: If it is determined that *all* schools within a County are missing
    data, a bordering County will be randomly selected (this would be
    done on a case by case basis) -- however, it is expected that the
    County-level will suffice (since the percent of schools with missing
    data is relatively small).

[^7]: These subgroups are the same as defined for SSOCS:2000 and
    SSOCS:2004.

[^8]: While the SASS/CCD assigns schools to one of eight locales, the
    SSOCS sample will be allocated to four locale types. Any missing
    data will be imputed using Hotdeck imputation. The amount of missing
    data in the SASS/CCD is small; 102 schools are missing data on
    locale. Data "donors" will be found by matching schools in the same
    County.