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NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Block-Level Descriptive Statistics by Public- and Nonpublic-School Sessions, as Defined After Scaling, Grade 8 Reading Combined National and State Main Assessment: 2003

NAEP Technical DocumentationBlock-level descriptive statistics by public- and nonpublic-school sessions, as defined after scaling, grade 8 reading combined national and state main assessment: 2003

Statistic	Type of school1	Block R3	Block R4	Block R5	Block R6	Block R7	Block R8	Block R9	Block R10	Block R11	Block R12	Block R132	Block R14	Block R15
Number of scaled items	†	10	9	11	12	13	10	9	12	12	10	13	10	10
Unweighted sample size	Public	20,800	20,800	20,800	20,800	20,800	20,900	20,800	21,000	20,800	20,900	20,900	20,800	20,800
	Nonpublic	1,200	1,200	1,200	1,200	1,200	1,200	1,200	1,200	1,200	1,200	1,200	1,200	1,200
Weighted average item score	Public	0.42	0.55	0.68	0.57	0.69	0.54	0.60	0.57	0.68	0.69	0.65	0.71	0.79
	Nonpublic	0.55	0.64	0.79	0.67	0.79	0.63	0.69	0.69	0.79	0.76	0.72	0.81	0.85
Weighted average polyserial	Public	0.69	0.63	0.71	0.64	0.71	0.63	0.66	0.62	0.70	0.62	0.59	0.70	0.68
	Nonpublic	0.66	0.59	0.75	0.60	0.69	0.58	0.66	0.57	0.64	0.57	0.54	0.72	0.63
Weighted alpha reliability	Public	0.76	0.70	0.76	0.72	0.78	0.71	0.69	0.73	0.79	0.68	0.73	0.69	0.66
	Nonpublic	0.73	0.60	0.71	0.60	0.67	0.61	0.61	0.63	0.69	0.52	0.61	0.61	0.53
Weighted proportion of students attempting last item3	Public	0.82	0.85	0.94	0.87	0.84	0.87	0.95	0.77	0.86	0.92	0.95	0.85	0.96
	Nonpublic	0.90	0.89	0.98	0.93	0.90	0.91	0.97	0.83	0.90	0.95	0.97	0.90	0.97
† Not applicable. 1 Nonpublic-school sample includes only Catholic and private schools. 2 A 50-minute block. 3 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), 2003 Reading Assessment.

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