NAEP Technical Documentation2015 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-, eighth-, and twelfth-grade students were assessed in mathematics, reading, science, and vocabulary.

A Special National Mathematics Assessment Study was also conducted in the private school samples for fourth- and eighth-grade.

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.

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.

Target sample sizes of assessed students, private school national assessment, by subject and grade: 2015

Grade	Total	Mathematics	Reading	Science	Vocabulary	Special Mathematics Assessment Study
Total	24,800	7,400	7,300	7,100	2,200	800
4	10,200	3,000	3,000	3,000	800	400
8	10,200	3,000	3,000	3,000	800	400
12	4,400	1,400	1,300	1,100	600	†
† Not applicable. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2015 National Assessment.

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