NAEP Technical DocumentationSummary Item Response Rates, Vocabulary National Assessment, by Item Type and Grade: 2015

Summary item response rates, vocabulary national assessment, by item type and grade: 2015

Grade	Statistic	Multiple-choice items	Dichotomous constructed-response items	Polytomous constructed-response items
4	Number of items1	41	†	†
	Average percent missing2	5.90	†	†
	Minimum	1.00	†	†
	Maximum	22.60	†	†
	Average percent off-task3	†	†	†
	Minimum	†	†	†
	Maximum	†	†	†
	Average weighted percent correct	59.38	†	†
8	Number of items1	57	†	†
	Average percent missing2	2.61	†	†
	Minimum	0.27	†	†
	Maximum	12.06	†	†
	Average percent off-task3	†	†	†
	Minimum	†	†	†
	Maximum	†	†	†
	Average weighted percent correct	71.83	†	†
12	Number of items1	49	†	†
	Average percent missing2	1.53	†	†
	Minimum	0.36	†	†
	Maximum	6.04	†	†
	Average percent off-task3	†	†	†
	Minimum	†	†	†
	Maximum	†	†	†
	Average weighted percent correct	68.55	†	†
† Not applicable. The vocabulary assessment includes only multiple-choice items.  1 The item counts include vocabulary items from both the half-blocks as well as the vocabulary items embedded within the 25-minute reading comprehension blocks. 2 Missing responses include the categories "omitted" and "not-reached." 3 An "off-task" response (constructed-response items only) is a response that is unrelated to the question and is considered inappropriate. 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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