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NAEP Sample Design → Sample Design for the 2001 Assessment → National Main Assessment Sample Design in 2001 → Participation Results for the 2001 National Main Assessment

NAEP Technical DocumentationParticipation Results for the 2001 National Main Assessment

			School Participation Student Participation Results

The National Center for Education Statistics (NCES) statistical standards require that weighted response rates exceed 85 percent. In some cases, the response rates for the 2001 assessment were achieved without the need to recruit substitute schools, and, in some cases, substitutes needed to be recruited. Weighted aggregations for each set of schools were calculated by dividing the frame enrollment by the school probability of selection. The weighted aggregations for the eligible schools for each jurisdiction are an estimate of the total population of students in the grade within each jurisdiction.

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