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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 4 Mathematics Combined National and State Main Assessment: 2005

NAEP Technical DocumentationBlock-level descriptive statistics by public- and nonpublic-school sessions, as defined after scaling, grade 4 mathematics combined national and state main assessment: 2005

Statistic	Type of school1	Block M3	Block M4	Block M5	Block M6	Block M7	Block M8	Block M9	Block M10	Block M11	Block M12
Number of scaled items	†	18	14	15	16	16	19	18	16	18	18
Unweighted sample size	Public	31,400	33,100	31,400	33,800	32,200	33,000	32,000	33,700	31,700	33,200
	Nonpublic	1,200	1,200	1,200	1,300	1,300	1,200	1,200	1,200	1,300	1,200
Weighted average item score	Public	0.53	0.51	0.50	0.58	0.49	0.55	0.57	0.55	0.59	0.61
	Nonpublic	0.57	0.57	0.54	0.63	0.53	0.58	0.62	0.61	0.62	0.66
Weighted average polyserial	Public	0.62	0.65	0.57	0.60	0.55	0.53	0.62	0.59	0.59	0.58
	Nonpublic	0.59	0.60	0.54	0.55	0.52	0.53	0.60	0.55	0.58	0.57
Weighted alpha reliability	Public	0.81	0.78	0.78	0.76	0.69	0.76	0.80	0.73	0.79	0.76
	Nonpublic	0.79	0.74	0.75	0.69	0.67	0.75	0.77	0.67	0.75	0.72
Weighted proportion of students attempting last item2	Public	0.91	0.89	0.67	0.94	0.84	0.66	0.86	0.95	0.92	0.97
	Nonpublic	0.95	0.91	0.72	0.98	0.90	0.72	0.94	0.97	0.97	0.99
† 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 Mathematics Assessment.

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