DOI: 10.3886/icpsr13285.v1
title: Census of Population and Housing, 2000 [United States]: Selected Subsets From Summary File 1, Advance National
title: Version 1

description: Prepared by the Inter-university Consortium for Political
 and Social Research, this data collection consists of selected subsets
 extracted from the Census of Population and Housing, 2000 [United
 States]: Summary File 1, Advance National (ICPSR 3325). Summary File 1
 data contain information compiled from the questions asked of all
 people and of every housing unit enumerated in Census 2000: questions
 covering sex, age, race, Hispanic or Latino origin, type of living
 quarters (household/group quarters), household relationship, housing
 unit vacancy status, and housing unit tenure (owner/renter). The
 information is presented in 286 tables, which are tabulated for every
 case, i.e., every geographic unit represented in the data. There is
 one variable per table cell, plus additional variables with geographic
 information. All cases in the summary file data are classified by
 levels of observation, known as "summary levels," in the Census
 Bureau's nomenclature. These levels of observation served as the
 selection criteria for the subsets. Each subset comprises all of the
 cases in one of five summary levels: the nation (summary level 010),
 states (summary level 040), counties (summary level 050), places
 (summary level 160), and five-digit ZIP code tabulation areas (summary
 level 860). Three files are supplied for each subset except the
 last. There is a single, relatively large, file that contains all of
 the tables in the data, plus two smaller files, each of which contains
 approximately one half of the tables. For the five-digit ZIP code
 tabulation areas, there is only one file, which contains all of the
tables.
description: Datasets: 
DS0: Study-Level Files
DS1: The Nation, All Tables
DS2: The Nation, Tables P1-PCT12E Only
DS3: The Nation, Tables PCT12F-H16I Only
DS4: States, All Tables
DS5: States, Tables P1-PCT12E Only
DS6: States, Tables PCT12F-H16I Only
DS7: Counties, All Tables
DS8: Counties, Tables P1-PCT12E Only
DS9: Counties, Tables PCT12F-H16I Only
DS10: Places, All Tables
DS11: Places, Tables P1-PCT12E Only
DS12: Places, Tables PCT12F-H16I Only
DS13: 5-Digit ZIP Code Tabulation Areas, All Tables
DS100: Data Dictionary for Complete Files
DS101: Data Dictionary for First Half Files
DS102: Data Dictionary for Second Half Files
DS103: SAS Data Definition Statements for Complete Files
DS104: SAS Data Definition Statements for First Half Files
DS105: SAS Data Definition Statements for Second Half Files
DS106: SPSS Data Definition Statements That Merge the Half Files
DS107: SPSS Data Definition Statements for First Half Files
DS108: SPSS Data Definition Statements for Second Half Files
DS109: SPSS Data Definition Statements for 5-Digit ZIP Code Tabulation Areas
DS110: Stata Data Definition Statements for Complete Files
DS111: Stata Data Definition Statements for First Half Files
DS112: Stata Data Definition Statements for Second Half Files
description: All persons and housing units in the United States.
description: (1) The original Summary File 1, Advance National data
 comprise 40 files. There is one column-delimited file that contains
 geographic identifiers (the geographic header record file or "Geo"
 file), plus 39 comma-delimited table files, each with a subset of
 tables in the data. Initial steps in the production of the subsets
 for this collection involved sorting the Geo file and the 39 table
 files in ascending order of the common identification variable
 LOGRECNO, reformatting the Geo file as a comma-delimited file, and
 stripping the first five identification variables from each of the 39
 table files (FILEID, STUSAB, CHARITER, CIFSN, and LOGRECNO). Next, the
 reformatted Geo file was merged with the stripped table files, end to
 end, so that corresponding records in the Geo and table files were
 joined as a single record in the merged file. Finally, each subset was
 generated by extracting from the merged file all cases with a given
 value for SUMLEV, the variable that identifies the summary
 level. Separate subsets were generated for summary levels 010, 040,
 050, 160, and 860. (2) To allow for compatibility with SPSS (as of
 August 2002), subsets with a record length greater than the SPSS limit
 of 32,767 were "split" into two files, each with a record length less
 than the limit. Three files are supplied for each of these subsets: a
 "first half" file containing the Geo variables and tables P1-PCT12E, a
 "second half" file containing the Geo variables and tables
 PCT12F-H16I, and a complete file (for non SPSS use) that contains the
 Geo variables and all of the tables, P1-H16I. (3) Each subset contains
 all of the geographic component iterations in its summary level, if
 any. (4) The implied decimal places of variables INTPTLAT (latitude)
 and INTPTLON (longitude) were made explicit in the subsets. In
 addition, the values of all Geo variables were enclosed in quotes,
 except for variables AREALAND, AREAWATR, POP100, HU100, INTPTLAT, and
 INTPTLON. (5) The data definition statements were tested with SAS 8,
 SPSS 10, and Stata/SE 7.0. (5) The codebook is provided by the
 principal investigator as a Portable Document Format (PDF) file. The
 PDF file format was developed by Adobe Systems Incorporated and can be
 accessed using PDF reader software, such as the Adobe Acrobat
 Reader. Information on how to obtain a copy of the Acrobat Reader is
 provided on the ICPSR Web site. (6) The codebook documents data
 collection procedures, concepts, and individual variables in the
 original Summary File data as well as the ICPSR-produced subsets, but
 not the layout and structure of the subsets. That information is
 contained in the data dictionary files provided with this
 collection. In particular, the "Data Structure and Segmentation"
 section in chapter 2 of the codebook and the variable locations shown
 in chapter 7 do not apply to the subsets. Every subset file record
 begins with the Geo variables in their original order. In a complete
 subset file, the Geo variables are followed by the 6th to last
 variables in table file 1, then the 6th to last variables in table
 file 2, and so on up to the 6th to last variables in table file
 39. Each "first half" file is a subset of a complete file: it begins
 with the first variable in the Geo file and ends with the last
 variable in table file 20. In a "second half" file, the Geo variables
 are followed by the 6th to last variables in table file 21, then the
 6th to last variables in table file 22, and so on up to the 6th to
last variables in table file 39.