NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Block-Level Descriptive Statistics as Defined After Scaling, Grade 4 Reading Combined National and State Main Assessment, by Public and Nonpublic School Sessions: 2009

NAEP Technical DocumentationBlock-level descriptive statistics as defined after scaling, grade 4 reading combined national and state main assessment, by public and nonpublic school sessions: 2009

Statistic	Type of School1	Block F3	Block F4	Block F5	Block F6	Block F7	Block F8	Block F9	Block F10	Block F11	Block F12	Block R1	Block R2	Block R3	Block R4	Block R5	Block R6	Block R7	Block R8	Block R9	Block R10
† Not applicable. 1 Nonpublic school sample includes only Private and Catholic schools. 2 The "Weighted proportion of students attempting last item" is equal to 1 - (Percent not responding to last item /100). SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2009 Reading Assessment.
Number of scaled items	†	10	10	11	9	10	10	10	10	10	10	11	8	10	10	10	10	10	10	9	10
Unweighted sample size	Public	17,900	17,800	17,700	17,800	17,900	18,000	17,900	17,800	17,900	17,800	16,000	16,100	16,100	16,000	16,100	16,000	16,000	16,100	16,100	16,200
	Nonpublic	300	300	300	300	300	300	300	300	400	300	300	300	300	300	300	300	300	300	300	300
Weighted average item score	Public	0.66	0.71	0.45	0.64	0.50	0.59	0.78	0.63	0.76	0.64	0.61	0.64	0.53	0.61	0.48	0.51	0.56	0.50	0.57	0.50
	Nonpublic	0.72	0.79	0.52	0.73	0.55	0.68	0.85	0.73	0.82	0.72	0.67	0.70	0.60	0.68	0.56	0.57	0.65	0.56	0.63	0.59
Weighted average polyserial	Public	0.69	0.78	0.61	0.71	0.62	0.70	0.70	0.66	0.75	0.70	0.63	0.67	0.62	0.62	0.61	0.65	0.61	0.64	0.62	0.60
	Nonpublic	0.64	0.78	0.63	0.75	0.57	0.70	0.67	0.64	0.72	0.66	0.65	0.69	0.60	0.60	0.58	0.69	0.63	0.63	0.62	0.56
Weighted alpha reliability	Public	0.75	0.80	0.72	0.77	0.70	0.76	0.74	0.74	0.72	0.74	0.74	0.66	0.72	0.73	0.70	0.74	0.70	0.71	0.66	0.71
	Nonpublic	0.63	0.75	0.72	0.73	0.61	0.74	0.62	0.69	0.58	0.66	0.71	0.67	0.67	0.67	0.65	0.76	0.68	0.68	0.61	0.60
Weighted proportion of students attempting last item2	Public	0.87	0.84	0.77	0.72	0.80	0.80	0.82	0.82	0.89	0.85	0.83	0.82	0.81	0.78	0.76	0.80	0.78	0.75	0.89	0.71
	Nonpublic	0.95	0.92	0.87	0.79	0.89	0.91	0.93	0.92	0.93	0.94	0.89	0.87	0.89	0.85	0.85	0.92	0.88	0.83	0.95	0.83

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