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NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Overall Descriptive Statistics for Item Blocks as Defined After Scaling, Grade 12 U.S. History National Main Assessment: 2006

NAEP Technical DocumentationOverall descriptive statistics for item blocks as defined after scaling, grade 12 U.S. history national main assessment: 2006

Statistic	Item type	Block H3	Block H4	Block H5	Block H6	Block H7	Block H8	Block H9	Block H10	Block H11
Number of scaled items	Total	18	18	18	17	18	16	16	16	16
	Multiple choice	13	13	13	12	13	12	12	11	6
	Dichotomously scored constructed response	0	3	0	0	0	0	0	1	0
	Polytomously scored constructed response	5	2	5	5	5	4	4	4	10
Unweighted sample size	†	2,300	2,300	2,300	2,200	2,200	2,300	2,300	2,300	2,200
Weighted average item score	†	0.47	0.42	0.48	0.43	0.45	0.47	0.57	0.50	0.58
Weighted average polyserial	†	0.53	0.59	0.53	0.57	0.50	0.57	0.57	0.56	0.67
Weighted alpha reliability	†	0.75	0.80	0.76	0.74	0.72	0.74	0.76	0.72	0.84
Weighted proportion of students attempting last item1	†	0.90	0.90	0.97	0.98	0.92	0.97	0.99	0.93	0.93
† 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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