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NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Overall Descriptive Statistics for Item Blocks as Defined After Scaling, Grade 8 Visual Arts National Assessment, by Block and Item Type: 2016

NAEP Technical DocumentationOverall Descriptive Statistics for Item Blocks as Defined After Scaling, Grade 8 Visual Arts National Assessment, by Block and Item Type: 2016

Overall descriptive statistics for item blocks as defined after scaling, grade 8 visual arts national assessment, by block and item type: 2016
Statistic	Item type	Block V3	Block V4	Block V5	Block V6
Number of scaled items	Total	6	12	9	6
	Multiple choice	2	4	3	2
	Dichotomously scored constructed-response	0	2	1	0
	Polytomously scored constructed-response	4	6	5	4
Unweighted sample size	†	2,200	2,200	2,300	2,200
Weighted average item score¹	†	.42	.48	.44	.50
Weighted average polyserial	†	.59	.51	.56	.60
Weighted alpha reliability	†	.50	.68	.59	.43
Weighted proportion of students attempting last item²	†	.74	.84	.73	1.00
† Not applicable. ¹ The "Weighted average item score" of polytomous items is standardized to have a scale of 0 to 1 so they are comparable to dichotomously scored items. 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. In 2016, 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), 2016 Visual Arts Assessment.

Last updated 18 March 2022 (PG)

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