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NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Block-Level Descriptive Statistics as Defined After Scaling, Grade 8 Reading Combined National and State Main Assessment, by Public and Nonpublic School Sessions: 2007

NAEP Technical DocumentationBlock-level descriptive statistics as defined after scaling, grade 8 reading combined national and state main assessment, by public and nonpublicschool sessions: 2007

Statistic	Type of school	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
Number of scaled items	†	10	9	11	12	10	11	10	12	12	10	13	10	10
Unweighted sample size	Public	23,100	23,200	23,100	23,100	23,100	23,200	23,100	23,200	23,100	23,100	15,500	23,100	23,200
	Nonpublic	500	500	500	500	500	500	500	500	500	500	300	500	500
Weighted average item score	Public	0.41	0.63	0.68	0.57	0.74	0.71	0.72	0.56	0.67	0.66	0.64	0.73	0.79
	Nonpublic	0.52	0.70	0.78	0.66	0.81	0.79	0.80	0.68	0.77	0.75	0.69	0.81	0.86
Weighted average polyserial	Public	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
	Nonpublic	0.65	0.65	0.68	0.57	0.69	0.64	0.82	0.57	0.61	0.71	0.60	0.67	0.60
Weighted alpha reliability	Public	0.74	0.66	0.76	0.71	0.67	0.69	0.75	0.73	0.76	0.77	0.72	0.68	0.67
	Nonpublic	0.72	0.58	0.67	0.59	0.61	0.60	0.73	0.64	0.64	0.71	0.71	0.56	0.46
Weighted proportion of students attempting last item1	Public	0.82	0.90	0.94	0.89	0.97	0.95	0.99	0.76	0.87	0.95	0.92	0.86	0.96
	Nonpublic	0.85	0.95	0.98	0.93	0.98	0.94	0.99	0.80	0.90	0.97	0.95	0.91	0.99
† Not applicable. 1 The "Weighted proportion of students attempting last item" is equal to 1 - (Percent not responding to last item /100). NOTE: Nonpublic school samples include only Private and Catholic schools. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2007 Reading Assessment.

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