NAEP Technical DocumentationSchool and Student Participation in the 2015 Twelfth-Grade Public School National Assessment
 

			Weighted School Response Rates Weighted Student Response and Exclusion Rates for Mathematics Weighted Student Response and Exclusion Rates for Reading  Weighted Student Response and Exclusion Rates for Science

Twelfth-grade public school participation in NAEP is not mandatory. Although a small portion of the participating school sample consisted of substitute schools, it is preferable when calculating school response rates to do so on the basis of school participation before substitution.

Within participating schools, not every sampled student is assessed. Sampled students who do not take a NAEP assessment fall into one of the following categories:

• withdrawn students;
• excluded students with disabilities (SD);
• excluded English learners (EL); or
• students absent from both the original session and the make-up session (not excluded but not assessed).

Withdrawn students are those who have left the school before the original assessment.

Excluded students are SD or EL students that were determined by their school to be unable to meaningfully take the NAEP assessment in their assigned subject, even with an accommodation.

Absent students are students who were eligible to be assessed but were not assessed either due to absence from both original and make-up sessions or because of a refusal to participate.

Printer-friendly Version