NAEP Technical Documentation2017 Public School National Writing Assessment

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

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

The target sample size for the public school writing assessment samples was 19,800 assessed students at both grade 4 and grade 8. Prior to sampling, the target sample size was adjusted upward to offset expected 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 sample of schools was selected with probability proportional to a measure of size based on estimated grade-specific enrollment in the schools.

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