PROGRESS IN INTERNATIONAL READING LITERACY 

STUDY (PIRLS 2016) FIELD TEST AND RECRUITMENT 

FOR MAIN STUDY

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SUPPORTING STATEMENT PART B

Submitted by:

National Center for Education Statistics

U.S. Department of Education

Institute of Education Sciences

Washington, DC

August 2014
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B. COLLECTION OF INFORMATION EMPLOYING STATISTICAL INFORMATION

B.1 Respondent Universe 

The respondent universe for the PIRLS field test is all students enrolled in grade 4 that are at least 9.5 years of age, 

during the 2014-2015 school year. The universe for the selection of schools is all types of schools in seven 

populous states. A sample of 50 schools will be selected for the field test, with the goal of obtaining participation 

from a minimum of 25 schools. Within sampled schools, students will be selected for participation by drawing a 

random sample of two classes. Only students in intact classrooms will be assessed at each grade. Parents of 

participating students will also be included for the purpose of collecting survey data.

B.2 Statistical Methodology

Field Test Sampling Plan and Sample

The purpose of the PIRLS field test is to test out new assessment items and background questions, and to ensure 

that classroom and student sampling procedures proposed for the main study are successful. In selecting a school 

sample for this purpose, it is important to minimize the burden on schools, districts, and states, to minimize impact 

on these entities while also ensuring that the field test data are collected effectively.

As required by the TIMSS and PIRLS International Study Center, the field test sample is to consist of 25 schools 

with 800 students assessed. The student samples will be obtained by selecting two classes from each school. As the 

field test is designed only to test items, questions, and procedures, a probability sample of schools is not required. 

However, the sample must include a broad range of schools covering such features as public (including charter 

schools), private, large, small, urban, and rural schools, and schools from a variety of different states.

The field test sample will be drawn after the main study sample, and schools will be selected for the field test from 

the set of schools not included in the main study sample. We will draw the field test sample from five states –

California, Illinois, New York, North Carolina, and Texas – chosen because of their large size and diverse 

demographics. This will allow for achieving the desired distribution of schools by region, poverty level, and 

ethnicity, and will inform the recruitment and data collection process for the nation as a whole. 

Schools in California, Illinois, New York, North Carolina, and Texas that are not selected into the main study 

sample will comprise the field test sampling frame and will be stratified by state, high/low poverty,1and 

public/private status, resulting in 15 different strata. Serpentine sorting will be used to sort schools by locale (city, 

suburb, town, and rural), race/ethnicity status (“15 percent or above” or “below 15 percent” Black, Hispanic, Asian 

and Pacific Islander, and American Indian and Alaskan Native students), and fourth grade enrollment within each 

stratum. A purposive sample of 25 schools will be selected for the field test which allocates equally to the separate 

states, although purposive selection of schools within the states will be conducted to ensure that to the extent 

possible, the proportion of schools in the field test closely aligns with the proportion of schools in the main study 

school sampling frame on the margins of the stratification and sort characteristics described previously. In addition, 

we will investigate the possibility of NAEP or other NCES studies taking place in schools around the same time as 

the field test and will select the PIRLS field test sample so as to minimize overlap with the NAEP sample. Two 

replacement schools will be selected for each of the 25 sampled schools from the same strata, and will have the 

 

1 High poverty schools are defined as having 50% or more students eligible for participation in the National School Lunch 

Program (NSLP), and low poverty schools have less than 50% of students eligible for NSLP. Private schools are all classified 

as low poverty because no NSLP information is available.
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same sort characteristics as the corresponding sampled schools. Once the field test sample has been selected, a 

summary of the distribution of the characteristics of the selected schools will be prepared, showing the comparison 

with the national population of schools. 

The student sampling procedures for the field test will correspond as closely as feasible to what is planned for the 

main study, so as to try out the operational procedures for student sample selection. The sample will be selected by 

selecting one or two classes per school, depending on the number of classes available at grade 4. Each participating 

school will be asked to submit an exhaustive list of classes (that is, a list that accounts for each student in the grade 

exactly once). Smaller classes will be combined to form “pseudoclasses” for the purposes of sampling. Once the list 

of classes is submitted, we will use a sampling algorithm to select two classes (or pseudoclasses) with equal 

probability. The student sample will then consist of all students in the selected classes. Additionally, parents of 

participating students will receive a survey that will be collected by the school.

We plan to gather class and student lists from participating schools electronically using a secure electronic filing 

process (as explained in Part A). Electronic filing provides advantageous features such as efficiency and data 

quality checks. Schools will access the electronic filing system through a web site.

Main Study Sampling Plan and Sample

The school sample design for the main study must be more rigorous than that for the field test. It must be a 

probability sample of schools that fully represents the entire United States. At the same time, to ensure maximum 

participation it must be designed so as to minimize overlap with other NCES studies involving student assessment 

that will be conducted around the same time.

The main study will take place in the spring of 2016, about two months after the Main NAEP 2015 assessment. 

NAEP will assess several hundred schools nationally, at grades 4, 8, and 12. To be fully representative, the PIRLS

sample may include some schools that will have participated in the Main NAEP 2015 at the same grade. However, 

this number can be kept to a minimum. 

The sample size for the PIRLS main study will be 150 schools. For each original sample school, two replacement 

schools will also be identified. The sampling frame will be obtained from the most current versions of NCES’s 

Common Core of Data (CCD) and Private School Survey (PSS) files, restricted to schools having grade 4, and 

eliminating schools in Puerto Rico, U.S. territories, and Department of Defense overseas schools.

The sample will be stratified according to school characteristics such as public/private, Census region, poverty 

status (as measured by the percentage of students in the school receiving free or reduced-price lunch in the National 

School Lunch Program (NSLP)). This will ensure an appropriate representation of each type of school in the 

selected sample of schools.

Determining school eligibility, student eligibility, and student sampling will be accomplished as described below.

Schools will be selected with probability proportional to the number of estimated classes at grade 4, with schools 

expected to have either one or two classes being given the same selection probability. The use of a probability 

proportional to sample design ensures that all students have an approximately equal chance of selection, since two 

classes will be selected from each school regardless of the size of the school. Note that we will modify this equal 

probability design in the following way. So as to increase the available sample size of students in high poverty 

schools, we will double the probability of selection of each school with at least 50 percent of students eligible for 

free or reduced-price lunch under NSLP, relative to other schools of the same size.
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Student sampling will be accomplished by selecting one to two classes per school. Each grade 4 school will be 

asked to prepare a list of classes that is comprehensive, and includes each grade 4 student in the school in one of the 

listed classes. As described above, schools will submit these classes and student lists via secure E-filing. Any class 

with fewer than ten students will be combined with another class to form a ‘pseudoclass’ with at least ten students 

in it. We will then select two classes (or pseudoclasses) from each school, with equal probability, and all students in 

those classes/pseudoclasses will be included in the sample. If a school has only one or two classes, then all students 

in the grade will be included in the sample. 

Nonresponse Bias Analysis, Weighting, and Sampling Errors

It is inevitable that nonresponse will occur at both levels: school and student. We will analyze the nonrespondents 

and provide information about whether and how they differ from the respondents along dimensions for which we 

have data for the nonresponding units, as required by NCES standards. After the calculation of weights, sampling 

errors will be calculated for a selection of key indicators incorporating the full complexity of the design, that is, 

clustering and stratification (see Appendix B for more detail).

B.3 Maximizing Response Rates

The most significant challenge in recruitment for PIRLS has been engaging the schools and gaining their 

cooperation. Given that classrooms are selected, student participation is not as great of a challenge. Historically 

student participation rates have never fallen below 90 percent (see table 1). That said, it is important to U.S. PIRLS

that students are engaged and try hard on the assessment.

Table 1. Historical PIRLS school and student participation rates 

Year School Participation Rate Overall Student Participation Rate Before Replacement After Replacement

2011 80 85 96

2006 57 86 95

2001 62 87 55

Our approach to school recruitment is to:

 Obtain endorsements about the value of PIRLS from relevant organizations;

 Work with NAEP state coordinators;

 Inform Chief State School Officers and test directors about the sample of schools in their state. Enclose a 

sample letter of endorsement they can send to schools; 

 Send letters and informational materials to schools and districts. These letters will be customized by the type 

of school;

 Train experienced school recruiters about PIRLS;

 Implement strategies from NAEP’s Private School Recruiting Toolkit. This toolkit, developed for NAEP, 

includes well-honed techniques used to recruit a very challenging type of schools;

 Follow-up mailings with telephone calls to explain the study and schools involvement, including placing the 

PIRLS assessment date on school calendars;

 Conduct an experiment in the field test to compare the effectiveness of offering schools $200 for participation 

versus offering schools two iPad minis loaded with grade-level appropriate reading materials;

 Maintain continued contact until schools have built a relationship with the recruiter and fully understand 

PIRLS; 

 Offer a $100 incentive to the individual at the school identified to serve as the school coordinator; and

 Make in-person visits to some schools, as necessary.
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Our approach to student recruitment is to:

 Send parental permission forms home to parents. Implied permission is encouraged but written permission 

will be collected if required by the school district or school;

 Encourage the teacher to encourage student participation; 

 Offer participating students a small gift valued at approximately $4. In PIRLS 2011, each participating 

student received a small watch/stop watch that could be clipped securely (with an attached karabiner) to a 

backpack or belt loop. A similarly priced item will be distributed to participating students for the PIRLS 2016 

data collection; 

 Students will also receive a certificate with their name thanking them for participating in and representing the 

United States in PIRLS 2016; and

 When feasible, have the test administrator speak to the students prior to the scheduled test day to encourage 

participation.

Our approach to teacher recruitment is to:

 Send letters and informational materials to teachers;

 Provide the option of an electronic or hard-copy questionnaire; 

 Offer a $20 incentive for participation; and

 Have the test administrator speak to the teacher on the day of the student session.

Our approach to parent recruitment is to:

 Request parent contact information from school coordinators, with which a mailing will be sent from RTI 

with a letter, study brochure, and hard-copy questionnaire inviting parents to participate either electronically 

or via paper and pencil. If the school will not provide contact information, information packets will be 

prepared and schools will be asked to send them home to parents;

 Provide the option of an electronic or hard-copy questionnaire;

 Reminder letters will be sent to parents either by mail or through the school; 

 School coordinators will be asked to contact parents directly to encourage participation. Those school 

coordinators who play an active role in prompting parents will receive an additional incentive according to 

response rate threshold achieved when both the parent and their student participates. School coordinators who 

opt not to contact parents directly will not receive additional incentive money. Four threshold levels are 

proposed to school coordinators who contact parents and receive responses from parent-student pairs: 

Parent and student response pair Additional Incentive

90-100% $100

80-90% $75

70-80% $50

Under 70% $25

 If the school coordinator does not actively contact parents, test administrators will call parents to remind them 

to complete the questionnaire, when contact information is available; and 

 Parent respondents whose student also participates in PIRLS will be offered $20 for participating.

B.4 Purpose of Field Test and Data Uses

The central goals are to test out new assessment items and background questions, and to ensure that 

classroom and student sampling procedures proposed for the main study are successful. In addition, an 

experiment will be conducted to compare the effectiveness of offering schools $200 for participation 

versus offering schools two iPad minis loaded with grade-level appropriate reading materials. Schools 

will be randomly assigned an incentive treatment upon drawing the sample. Power analyses were 
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performed to examine the corresponding power for the proposed field test sample size in each of the two 

incentive groups. Because of the small sample size of the field test, the power to detect any difference is 

below 50% across a variety of explored scenarios. Thus we will base the decision regarding the incentive 

to be used in the main study on overall results and qualitative feedback obtained during the recruitment

process.

B.5 Individuals Consulted on Study Design

Overall direction for PIRLS is provided by Dr. Sheila Thompson, National Research Coordinator, National Center 

for Education Statistics, U.S. Department of Education.

The following persons are responsible for the statistical design of PIRLS:

 Pierre Foy. TIMSS and PIRLS International Study Center, Boston College (617-552-6253); and

 Marc Joncas and Jean Dumais, Statistics Canada (613-951-0007).

Contractors responsible for sampling and data analysis:

 David Wilson, RTI International (919-541-6990);

 Patricia Green, RTI International (312-456-5260); and

 Ben Dalton, RTI International (919-541-7228).

Analysis and reporting will be performed by:

 TIMSS and PIRLS International Study Center, Boston College;

 RTI International;

 Insight Policy Research; and

 National Center for Education Statistics, U.S. Department of Education.