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Participation, 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.


Last updated 09 March 2011 (GF)
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National Center for Education Statistics -
U.S. Department of Education