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NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Overall Descriptive Statistics for Items as Defined After Scaling, Grade 8 Reading Combined National and State Main Assessment: 2007

NAEP Technical DocumentationOverall descriptive statistics for items as defined after scaling, grade 8 reading combined national and state main assessment: 2007

Statistic	Item type	Block R3	Block R4	Block R5	Block R6	Block R7	Block R8	Block R9	Block R10	Block R11	Block R12	Block R13	Block R14	Block R15
† 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), 2007 Reading Assessment.
Number of scaled items	Total	10	9	11	12	10	11	10	12	12	10	13	10	10
	Multiple choice	3	5	7	5	5	6	6	4	3	5	4	6	6
	Dichotomously scored constructed response	4	0	3	5	0	3	1	7	8	1	2	2	0
	Polytomously scored constructed response	3	4	1	2	5	2	3	1	1	4	7	2	4
Unweighted sample size	†	23,900	24,100	23,900	23,900	24,000	24,100	24,000	24,100	24,000	24,000	16,100	24,000	24,100
Weighted average item score	†	0.42	0.63	0.69	0.58	0.75	0.72	0.72	0.57	0.68	0.67	0.64	0.73	0.79
Weighted average polyserial	†	0.68	0.66	0.71	0.63	0.66	0.66	0.75	0.62	0.67	0.71	0.59	0.69	0.69
Weighted alpha reliability	†	0.74	0.66	0.76	0.71	0.67	0.69	0.75	0.73	0.76	0.76	0.73	0.68	0.66
Weighted proportion of students attempting last item1	†	0.82	0.91	0.95	0.89	0.97	0.95	0.99	0.77	0.87	0.95	0.92	0.86	0.96

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