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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 Reading National Main Assessment: 2002

NAEP Technical DocumentationOverall descriptive statistics for item blocks as defined after scaling, grade 12 reading national main assessment: 2002

Statistic	Item type	Block R3	Block R4	Block R5	Block R6	Block R7	Block R8	Block R9	Block R10	Block R11	Block R131	Block R141
Number of scaled items	Total	10	9	8	12	11	8	9	12	10	16	7
	Multiple choice	3	3	1	5	5	1	4	4	4	10	0
	Dichotomously scored constructed response	3	6	1	5	6	1	1	7	3	4	0
	Polytomously scored constructed response	4	0	6	2	0	6	4	1	3	2	7
Unweighted sample size	†	2,300	2,200	2,300	2,300	2,200	2,200	2,200	2,300	2,300	2,300	2,200
Weighted average item score	†	0.55	0.52	0.46	0.67	0.52	0.55	0.75	0.71	0.56	0.62	0.38
Weighted average polyserial	†	0.71	0.69	0.65	0.70	0.62	0.65	0.77	0.66	0.69	0.62	0.68
Weighted alpha reliability	†	0.79	0.70	0.70	0.70	0.64	0.71	0.71	0.73	0.76	0.79	0.68
Weighted proportion of students attempting last item2	†	0.85	0.73	0.82	0.93	0.83	0.89	0.95	0.85	0.87	0.97	0.95
† Not applicable. 1 A 50-minute block. 2 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), 2002 Reading Assessment.

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