NAEP Assessment Sample Design → NAEP 2011 Sample Design → Sample Design for the 2011 National Assessment → 2011 Fourth- and Eighth-Grade Private School National Assessment

NAEP Technical Documentation2011 Fourth- and Eighth-Grade Private School National Assessment

			Target Population Sampling Frame Stratification of Schools School Sample Selection Substitute Schools Ineligible Schools Student Sample Selection School and Student Participation

The private school samples were designed to produce nationally representative samples of students enrolled in private schools in the United States. Fourth- and eighth-grade students were assessed in mathematics and reading.  

Private school students were sampled for the eighth-grade national science assessment at a very low rate. The three operational subjects (reading, mathematics, science) were sampled in the ratio of 9:9:1. This ensured enough private school sample to report a national science result, but does not support breakdowns by type of private school.

Reading pilots and a special mathematics assessment in Puerto Rico were also conducted in the private school samples for fourth grade.

Oversampling of private schools at grades 4 and 8, last implemented in 2005, was reintroduced. Response rates permitting, allowed separate reporting for reading and mathematics, for Catholic, Lutheran, Conservative Christian, and other private schools.

The target sample sizes of assessed students for each grade and subject are shown in the table below. Prior to sampling, these target sample sizes were adjusted upward to offset expected rates of school and student attrition due to nonresponse and ineligibility.

                                                 

Target sample sizes of assessed students, private school national assessment, by subject and grade: 2011

Grade	Total	Mathematics	Mathematics pilot	Reading	Reading pilot	Science	Special mathematics assessment
† Not applicable. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2011 National Assessment.
Total	25,240	12,000	200	12,000	220	670	150
4	12,570	6,000	200	6,000	220	†	150
8	12,670	6,000	†	6,000	†	670	†

Samples were based on a two-stage design that involved selection of schools within strata and selection of students within schools. The first-stage samples of schools were selected with probability proportional to a measure of size based on the estimated grade-specific enrollment in the schools.

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