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NAEP Technical DocumentationSummary item response rates, mathematics long-term trend assessment, by item type and age: 2012

Age	Statistic	Multiple-choice items	Dichotomous constructed-response items	Polytomous constructed-response items
† Not applicable. 1 Missing responses includes 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), 2012 Mathematics Long-Term Trend Assessment.
9	Number of items	101	36	0
	Average percent missing1	5.76	7.06	†
	Minimum	0.52	0.97	†
	Maximum	21.14	23.68	†
	Average percent off-task2	†	0.07	†
	Minimum	†	0.00	†
	Maximum	†	0.38	†
	Average weighted percentage correct	68.61	63.45	†
13	Number of items	121	36	0
	Average percent missing1	4.34	4.15	†
	Minimum	0.21	0.14	†
	Maximum	31.61	30.67	†
	Average percent off-task2	†	0.08	†
	Minimum	†	0.00	†
	Maximum	†	0.49	†
	Average weighted percentage correct	68.85	69.23	†
17	Number of items	126	31	0
	Average percent missing1	3.83	6.33	†
	Minimum	0.33	0.86	†
	Maximum	19.75	27.11	†
	Average percent off-task2	†	0.52	†
	Minimum	†	0.02	†
	Maximum	†	2.36	†
	Average weighted percentage correct	69.80	58.89	†

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