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Summary Response Rates for the NAEP 2008 Mathematics Long-Term Trend Assessment

Summary item response rates, by item type and age, mathematics LTT assessment: 2008
Age Statistic Multiple-choice items Dichotomous constructed-response items Polytomous constructed-response items
† Not applicable.
1 Missing responses include the categories "omitted" and "not reached."
2 An "off-task" response (constructed-response items only) is a response that is unrelated to the question and is considered inappropriate.
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2008 Mathematics Long-term Trend Assessment.
9 Number of items 103.00 33.00
Average percent missing1 4.55 5.67
Minimum 0.58 0.67
Maximum 17.05 15.07
Average percent off-task2 0.12
Minimum 0.00
Maximum 1.62
Average weighted proportion correct 66.48 65.69
13 Number of items 120.00 36.00
Average percent missing1 3.05 3.85
Minimum 0.11 0.23
Maximum 25.71 26.39
Average percent off-task2 0.02
Minimum 0.00
Maximum 0.13
Average weighted proportion correct 68.21 66.72
17 Number of items 126.00 30.00
Average percent missing1 3.25 6.50
Minimum 0.42 0.85
Maximum 19.04 28.37
Average percent off-task2 0.24
Minimum 0.00
Maximum 1.28
Average weighted proportion correct 70.28 60.09

Last updated 01 November 2011 (JL)