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NAEP Technical DocumentationSummary Response Rates for the NAEP 2010 U.S. History National Assessment

Summary item response rates, U.S. history national assessment, by item type and grade: 2010

Grade	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), 2010 U.S. History Assessment.
4	Number of items	63	†	32
	Average percent missing1	7.78	†	11.37
	Minimum	0.73	†	1.48
	Maximum	28.84	†	32.80
	Average percent off-task2	†	†	0.61
	Minimum	†	†	0.00
	Maximum	†	†	1.94
	Average weighted proportion correct	49.34	†	40.20
8	Number of items	118	1	47
	Average percent missing1	2.01	11.81	8.61
	Minimum	0.10	11.81	0.51
	Maximum	10.26	11.81	19.13
	Average percent off-task2	†	0.98	1.22
	Minimum	†	0.98	0.00
	Maximum	†	0.98	2.62
	Average weighted proportion correct	52.11	38.19	32.68
12	Number of items	110	1	48
	Average percent missing1	1.94	3.52	10.42
	Minimum	0.21	3.52	0.87
	Maximum	8.54	3.52	49.43
	Average percent off-task2	†	0.49	1.11
	Minimum	†	0.49	0.05
	Maximum	†	0.49	6.37
	Average weighted proportion correct	52.75	27.73	37.14

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