Block-level Descriptive Statistics as Defined After Scaling, Grade 8 U.S. History National Assessment, by Public and Nonpublic School Sessions: 2014

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NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Block-level Descriptive Statistics as Defined After Scaling, Grade 8 U.S. History National Assessment, by Public and Nonpublic School Sessions: 2014

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Block-level Descriptive Statistics as Defined After Scaling, Grade 8 U.S. History National Assessment, by Public and Nonpublic School Sessions: 2014
Block-level descriptive statistics as defined after scaling, grade 8 U.S. history national assessment, by public and nonpublic school sessions: 2014
Statistic	Type of school¹	Block H3	Block H4	Block H5	Block H6	Block H7	Block H8	Block H9	Block H10	Block H11	Block H12
Number of scaled items	†	17	16	17	16	16	17	17	16	16	16
Unweighted sample size	Public	2,000	2,000	2,000	2,000	2,000	2,000	2,000	2,000	2,000	2,000
Unweighted sample size	Nonpublic	200	200	200	200	200	200	200	200	300	200
Weighted average item score²	Public	.57	.49	.45	.48	.51	.50	.40	.41	.38	.49
Weighted average item score²	Nonpublic	.67	.55	.50	.57	.61	.59	.47	.47	.44	.55
Weighted average polyserial	Public	.55	.53	.58	.53	.56	.52	.49	.49	.52	.56
Weighted average polyserial	Nonpublic	.56	.56	.56	.52	.57	.55	.49	.52	.48	.52
Weighted alpha reliability	Public	.73	.75	.75	.73	.75	.75	.69	.65	.70	.77
Weighted alpha reliability	Nonpublic	.72	.75	.73	.71	.73	.75	.68	.69	.64	.71
Weighted proportion of students attempting last item³	Public	.93	.94	.88	.92	.95	.86	.91	.89	.93	.91
Weighted proportion of students attempting last item³	Nonpublic	.95	.97	.92	.95	1.00	.91	.95	.92	.95	.97
† Not applicable. ¹ Nonpublic school sample includes only private schools, including Catholic schools. ²The "Weighted average item score" of polytomous items are standardized to have a scale of 0 to 1 so they are comparable to dischotomously scored items. ³ 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. In 2014, grades 4 and 12 were not assessed. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2014 U.S. History Assessment.

Last updated 23 May 2021 (SK)

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