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

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

Grade	Statistic	Multiple-choice items	Dichotomous items	Polytomous items
4	Number of items	66	5	26
	Average percent missing1	6.08	6.74	10.78
	Minimum	0.64	1.39	2.78
	Maximum	21.72	13.07	25.50
	Average percent off-task2	†	0.34	0.43
	Minimum	†	0.16	0.17
	Maximum	†	0.63	1.13
	Average weighted percent correct	64.11	54.82	41.58
8	Number of items	78	8	45
	Average percent missing1	2.63	3.90	7.45
	Minimum	0.22	1.33	1.07
	Maximum	11.93	9.14	28.27
	Average percent off-task2	†	0.22	0.31
	Minimum	†	0.11	0.04
	Maximum	†	0.39	0.85
	Average weighted percent correct	75.52	66.37	53.35
12	Number of items	79	10	43
	Average percent missing1	1.52	4.45	7.49
	Minimum	0.36	1.73	1.80
	Maximum	6.04	10.02	15.50
	Average percent off-task2	†	0.85	0.90
	Minimum	†	0.27	0.18
	Maximum	†	1.44	1.74
	Average weighted percent correct	70.49	56.72	50.85
† 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. 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 Reading Assessment.

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