NAEP Technical DocumentationFinal Participation, Exclusion, and Accommodation Rates for the 2015 Assessment

			Grade 4 Mathematics Grade 4 Reading Grade 4 Science Grade 4 Vocabulary Grade 8 Mathematics Grade 8 Reading Grade 8 Science Grade 8 Vocabulary Grade 12 Mathematics Grade 12 Reading  Grade 12 Science

Final participation, exclusion, and accommodation rates are presented in quality control tables for each grade and subject by geographic domain and school type. School and student-level participation rates have been calculated according to National Center for Education Statistics (NCES) standards as they have been for previous assessments.

School-level participation rates were below 85 percent for private schools at all three grades (4, 8, and 12) and for Bureau of Indian Education (BIE) schools at grades 4 and 8. Student-level participation rates were also below 85 percent for both public and private school samples at grade 12. As required by NCES standards, nonresponse bias analyses were conducted on each reporting group falling below the 85 percent participation threshold.

At grade 12, the reading and vocabulary samples were combined and reported together as reading. The quality control table for grade 12 reading reflects the combined data.

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