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NAEP Analysis and Scaling → Initial Activities → Summaries of Item-Level Response Rates for NAEP Assessments → Summary Item Response Rates, Science Combined National and State Assessment, by Item Type and Grade: 2015

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

Summary item response rates, science 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	109	9	41
	Average percent missing¹	7.75	5.26	9.68
	Minimum	0.53	2.43	0.28
	Maximum	36.45	8.18	32.33
	Average percent off-task²	†	0.28	0.30
	Minimum	†	0.04	#
	Maximum	†	0.62	1.28
	Average weighted percent correct	59.77	55.45	43.06
8	Number of items	121	1	52
	Average percent missing¹	4.65	5.77	9.05
	Minimum	0.30	5.77	0.94
	Maximum	31.01	5.77	43.52
	Average percent off-task²	†	0.62	0.51
	Minimum	†	0.62	#
	Maximum	†	0.62	2.18
	Average weighted percent correct	55.85	56.21	34.89
12	Number of items	132	0	62
	Average percent missing¹	3.53	†	9.15
	Minimum	0.32	†	0.74
	Maximum	11.67	†	32.56
	Average percent off-task²	†	†	1.32
	Minimum	†	†	#
	Maximum	†	†	4.97
	Average weighted percent correct	51.40	†	28.23
† 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 Science Assessment.

Last updated 16 November 2021 (ML)

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