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NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Overall Descriptive Statistics for Item Blocks as Defined After Scaling, Grade 4 U.S. History National Main Assessment: 2006

NAEP Technical DocumentationOverall descriptive statistics for item blocks as defined after scaling, grade 4 U.S. history national main assessment: 2006

Statistic	Item type	Block H3	Block H4	Block H5	Block H6	Block H7	Block H8
Number of scaled items	Total	16	16	15	16	16	17
	Multiple choice	11	11	10	10	11	11
	Dichotomously scored constructed response	0	1	0	0	0	2
	Polytomously scored constructed response	5	4	5	6	5	4
Unweighted sample size	†	2,200	2,200	2,100	2,100	2,200	2,100
Weighted average item score	†	0.43	0.45	0.48	0.41	0.45	0.43
Weighted average polyserial	†	0.49	0.52	0.51	0.54	0.47	0.48
Weighted alpha reliability	†	0.75	0.72	0.72	0.74	0.69	0.68
Weighted proportion of students attempting last item1	†	0.72	0.84	0.89	0.74	0.72	0.81
† Not applicable. 1 The "Weighted proportion of students attempting last item" is equal to 1 - (Percent not responding to last item /100). NOTE: 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), 2006 U.S. History Assessment.

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