NAEP Technical Documentation2013 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 and reading.

Mathematics and reading pilots, a Knowledge and Skills Appropriate (KaSA) Study, and a Reading accessible booklet study were 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.

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