NAEP Analysis and Scaling - Overall Descriptive Statistics for Items as Defined After Scaling, Grade 4 Mathematics Combined National and State Assessments, By Block: 2011

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NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Overall Descriptive Statistics for Items as Defined After Scaling, Grade 4 Mathematics Combined National and State Assessments, By Block: 2011

NAEP TECHNICAL DOCUMENTATIONOverall descriptive statistics for items as defined after scaling, grade 4 mathematics combined national and state assessments, by block: 2011
Statistic	Item type	Block M3	Block M4	Block M5	Block M6	Block M7	Block M8	Block M9	Block M10	Block M11	Block M12
† Not applicable. NOTE: The "weighted average item score" of polytomous items are standardized to have a scale of 0 to 1 so they are comparable to dichotomously scored items. The "weighted proportion of students attempting last item" is equal to 1 (percent not responding to last item /100). Item statistics in this table are described on the page Blocks of Items. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2011 Mathematics Assessment.
Number of scaled items	Total	15	15	15	16	15	19	16	15	16	16
	Multiple choice	10	11	10	13	9	13	11	11	10	12
	Dichtomously scored constructed response	1	1	3	1	2	2	0	0	0	1
	Polytomously scored constructed response	4	3	2	2	4	4	5	4	6	3
Unweighted sample size	†	41,500	41,600	41,600	42,400	41,300	41,800	41,500	41,500	42,300	42,100
Weighted average item score	†	.51	.53	.62	.60	.51	.56	.55	.56	.56	.53
Weighted average polyserial	†	.62	.60	.62	.60	.59	.53	.64	.58	.54	.57
Weighted alpha reliability	†	.77	.74	.77	.77	.76	.76	.78	.70	.71	.73
Weighted proportion of students attempting last item	†	.96	.90	.91	.94	.88	.68	.96	.96	.93	.90

Last updated 05 October 2020 (DS)

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