NAEP Technical DocumentationSummary Response Rates for the NAEP 2009 Reading Combined National and State Main Assessment

Summary item response rates, reading national assessment, by item type and grade: 2009
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), 2009 Reading Assessment.
4	Number of items	118	18	63
	Average percent missing¹	6.20	10.93	9.96
	Minimum	0.30	1.15	1.27
	Maximum	23.27	25.67	28.02
	Average percent off-task²	†	0.28	0.30
	Minimum	†	0.03	0.07
	Maximum	†	0.77	0.79
	Average weighted proportion correct	66.76	57.81	46.33
8	Number of items	138	38	81
	Average percent missing¹	1.89	7.03	5.85
	Minimum	0.13	0.65	0.72
	Maximum	12.90	21.37	26.26
	Average percent off-task²	†	0.41	0.36
	Minimum	†	0.09	0.05
	Maximum	†	0.87	1.65
	Average weighted proportion correct	73.30	62.58	53.97
12	Number of items	112	38	73
	Average percent missing¹	1.66	6.52	8.89
	Minimum	0.21	0.98	0.87
	Maximum	8.82	23.53	30.29
	Average percent off-task²	†	0.93	1.09
	Minimum	†	0.25	0.02
	Maximum	†	3.20	2.39
	Average weighted proportion correct	71.65	60.25	49.99

Last updated 06 January 2016 (GF)