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NAEP Sample Design → NAEP 2005 Sample Design → National Assessment Sample Design → Twelfth-Grade Public School National Assessment → Sampling of Schools for the 2005 National Twelfth-Grade Assessments

NAEP Technical DocumentationSampling of Schools for the 2005 National Twelfth-Grade Assessments

Like the state operational sample, the general goal for the national twelfth-grade sample was to achieve a self-weighting sample at the student level. The target sample size in each school was 135.

The measure of size computation was similar to that used for the fourth- and eighth-grade state assessment. For the twelfth-grade sample, only one "hit" was allowed per school.

Schools were ordered within each jurisdiction using the serpentine sort (by census division, urbanicity,  race/ethnicity status, and estimated grade enrollment). A systematic sample was then drawn using this serpentine sorted list and the measures of size. A total of 818 schools was selected from the 21,630 eligible public schools.

New and newly eligible schools were sampled from the new school frame. Thirteen schools were selected from the 747 new schools identified.

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