NAEP Technical DocumentationSummary Item Response Rates, Mathematics Combined National and State Assessment, by Item Type and Grade: 2015

Summary item response rates, mathematics combined national and state assessment, by item type and grade: 2015

Grade	Statistic	Multiple-choice items	Dichotomous constructed-response items	Polytomous constructed-response items
4	Number of items	105	23	29
	Average percent missing1	3.75	8.84	4.28
	Minimum	0.71	1.14	0.73
	Maximum	20.36	38.27	14.64
	Average percent off-task2	†	0.10	0.06
	Minimum	†	0.01	#
	Maximum	†	0.43	0.17
	Average weighted percent correct	60.99	45.42	47.48
8	Number of items	110	18	32
	Average percent missing1	4.03	5.41	9.34
	Minimum	0.52	1.07	0.79
	Maximum	22.46	13.53	23.32
	Average percent off-task2	†	0.20	0.38
	Minimum	†	0.04	0.01
	Maximum	†	0.65	2.56
	Average weighted percent correct	51.10	53.48	45.94
12	Number of items	131	32	43
	Average percent missing1	2.88	9.60	11.37
	Minimum	0.46	1.49	1.14
	Maximum	11.79	34.57	36.12
	Average percent off-task2	†	0.58	1.03
	Minimum	†	#	#
	Maximum	†	3.09	5.25
	Average weighted percent correct	48.18	33.63	24.08
† Not applicable. # Rounds to zero. 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. NOTE: The item counts in this table include component items only. Cluster items are not included in the counts. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2015 Mathematics Assessment.

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