Skip to main content

Table of Contents | Search Technical Documentation | References

NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Overall Descriptive Statistics for Item Blocks as Defined After Scaling, Grade 8 U.S. History National Assessment, by Block: 2014

NAEP Technical DocumentationOverall Descriptive Statistics for Item Blocks as Defined After Scaling, Grade 8 U.S. History National Assessment, by Block: 2014

Overall descriptive statistics for item blocks as defined after scaling, grade 8 U.S. history national assessment, by block: 2014
Statistic	Item type	Block H3	Block H4	Block H5	Block H6	Block H7	Block H8	Block H9	Block H10	Block H11	Block H12
Number of scaled items	Total	17	16	17	16	16	17	17	16	16	16
	Multiple choice	12	11	12	11	12	13	12	11	11	11
	Dichtomously scored constructed response	1	0	0	1	0	0	0	0	0	0
	Polytomously scored constructed response	4	5	5	4	4	4	5	5	5	5
Unweighted sample size	†	2,300	2,200	2,300	2,200	2,300	2,300	2,300	2,200	2,300	2,200
Weighted average item score	†	.58	.50	.45	.49	.52	.51	.40	.41	.39	.49
Weighted average polyserial	†	.56	.53	.58	.54	.56	.52	.49	.50	.51	.56
Weighted alpha reliability	†	.73	.75	.75	.73	.75	.75	.69	.65	.70	.77
Weighted proportion of students attempting last item¹	†	.93	.94	.89	.92	.96	.86	.91	.89	.93	.91
† Not applicable. ¹The "Weighted proportion of students attempting last item" is equal to 1 – (Percent not responding to last item / 100). NOTE: The "weighted average item score" of polytomous items are standardized to have a scale of 0 to 1 so they are comparable to dichotomously scored items. 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)

Printer-friendly Version