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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 12 Reading National Main Assessment: 2005

NAEP Technical DocumentationBlock-level descriptive statistics by public- and nonpublic-school sessions, as defined after scaling, grade 12 reading national main assessment: 2005

Statistic	Type of school1	Block R3	Block R4	Block R5	Block R6	Block R7	Block R8	Block R9	Block R10	Block R11	Block R13	Block R14
Number of scaled items	†	10	9	8	12	12	10	9	12	10	16	7
Unweighted sample size	Public	1,500	1,400	1,400	1,400	1,400	1,500	1,400	1,500	1,400	1,500	1,500
	Nonpublic	400	400	400	400	400	400	400	300	400	400	400
Weighted average item score	Public	0.52	0.49	0.47	0.67	0.52	0.67	0.75	0.69	0.55	0.61	0.37
	Nonpublic	0.62	0.59	0.53	0.74	0.56	0.75	0.84	0.77	0.60	0.68	0.43
Weighted average polyserial	Public	0.72	0.67	0.66	0.70	0.59	0.69	0.86	0.68	0.69	0.62	0.69
	Nonpublic	0.68	0.68	0.63	0.66	0.58	0.76	0.86	0.70	0.73	0.57	0.66
Weighted alpha reliability	Public	0.79	0.67	0.71	0.71	0.60	0.72	0.74	0.75	0.76	0.79	0.69
	Nonpublic	0.74	0.69	0.67	0.59	0.58	0.73	0.66	0.73	0.79	0.73	0.67
Weighted proportion of students attempting last item2	Public	0.88	0.73	0.83	0.91	0.85	0.96	0.91	0.86	0.87	0.97	0.95
	Nonpublic	0.93	0.77	0.90	0.95	0.90	0.96	0.97	0.86	0.90	0.97	0.97
† Not applicable. 1 Nonpublic-school sample includes only Catholic and private schools. 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), 2005 Reading Assessment.

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