NAEP Analysis and Scaling - Block-Level Descriptive Statistics by Public- and Nonpublic-School Sessions, as Defined After Scaling, Grade 4 Reading National Main Assessment (Accommodations Permitted [R3]): 2000

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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 Reading National Main Assessment (Accommodations Permitted [R3]): 2000

NAEP Technical DocumentationBlock-level description statistics by public- and nonpublic-school sessions, as defined after scaling, grade 4 reading national main assessment (accommodations permitted [R3]): 2000
Statistic	Type of school¹	Block R3	Block R4	Block R5	Block R6	Block R7	Block R8	Block R9	Block R10
Number of scaled items	†	9	12	11	9	10	9	9	12
Unweighted sample size	Public	1,500	1,500	1,500	1,500	1,500	1,500	1,500	1,500
Unweighted sample size	Nonpublic	500	500	500	500	500	500	500	500
Weighted average item score	Public	0.47	0.62	0.43	0.58	0.42	0.51	0.59	0.64
Weighted average item score	Nonpublic	0.57	0.71	0.53	0.70	0.51	0.58	0.65	0.70
Weighted alpha reliability	Public	0.71	0.80	0.75	0.79	0.72	0.74	0.78	0.79
Weighted alpha reliability	Nonpublic	0.62	0.68	0.75	0.74	0.73	0.65	0.74	0.74
Weighted average polyserial	Public	0.66	0.69	0.64	0.73	0.68	0.65	0.65	0.67
Weighted average polyserial	Nonpublic	0.62	0.61	0.65	0.72	0.68	0.60	0.66	0.67
Weighted proportion of students attempting last item²	Public	0.74	0.67	0.75	0.71	0.63	0.73	0.71	0.84
Weighted proportion of students attempting last item²	Nonpublic	0.85	0.77	0.84	0.78	0.75	0.83	0.81	0.91
† 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), 2000.

Last updated 11 July 2008 (DB)

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