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NAEP Technical DocumentationSummary 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)