NAEP Technical Documentation2017 Private School National Assessment in Mathematics and Reading

			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 for mathematics and reading 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.

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: 2017

Grade	Total	Mathematics	Reading
Total	14,400	7,200	7,200
4	7,200	3,600	3,600
8	7,200	3,600	3,600
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2017 National Assessment.

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