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NAEP Technical Documentation2010 Private School Sample
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The NAEP 2010 sample design yielded nationally representative samples of private school students in grades 4, 8, and 12 through a three-stage approach: selection of primary sampling units (PSUs), selection of schools within strata, and selection of students within schools. The sample of schools was selected with probability proportional to a measure of size based on the estimated grade enrollment in the schools.
The 2010 sampling plan was designed to assess 3,000 fourth-graders, 3,800 eighth-graders, and 3,500 twelfth-graders. These students were allocated among several tests. The operational tests were in civics, geography, and U.S. history for grades 4, 8, and 12. Pilot tests in writing (grades 4, 8, and 12) and mathematics (grades 4 and 8) were also administered. Target sample sizes were adjusted to reflect expected private school and student response and eligibility.
Schools on the sampling frame were explicitly stratified prior to sampling by private school affiliation (Catholic, non-Catholic private, and unaffiliated). Within affiliation type, schools were implicitly stratified by PSU type (certainty/noncertainty). In certainty PSUs, further stratification was by census region, urban-centric locale, and estimated grade enrollment. In noncertainty PSUs, additional stratification was by PSU stratum, urban-centric locale, and estimated grade enrollment.
From the stratified frame of private schools, systematic random samples of fourth-, eighth-, and twelfth-grade schools were drawn with probability proportional to a measure of size based on the estimated grade enrollment of the school in the relevant grade.
Each selected school in the private school sample provided a list of eligible enrolled students from which a systematic, equal probability sample of students was drawn.
Last updated 25 April 2011 (EH)