NAEP Assessment Weighting Procedures → Weighting Procedures for the 2008 Assessment → Weighting Procedures for the 2008 LTT Assessment → Quality Control for Weighting Procedures for the 2008 LTT Assessment → Participation, Exclusion, and Accommodation Rates for the 2008 LTT Assessment

NAEP Technical DocumentationParticipation, Exclusion, and Accommodation Rates for the 2008 LTT Assessment

			Age 9 Mathematics Age 9 Reading Age 13 Mathematics Age 13 Reading Age 17 Mathematics Age 17 Reading

Final participation, exclusion, and accommodation rates were presented in quality control tables for each age and subject by reporting group. School-level participation rates were calculated as they had been calculated for previous assessments and according to National Center for Education Statistics (NCES) standards.

School-level participation rates were below 85 percent for private schools at all three ages. Student-level participation rates were all above 85 percent. As required by NCES standards, nonresponse bias analyses were conducted on each reporting group falling below the 85 percent participation threshold.

 

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