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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 Music National Assessment, by Block and Item Type: 2016

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

Overall descriptive statistics for item blocks as defined after scaling, grade 8 music national assessment, by block and item type: 2016
Statistic	Item type	Block U3	Block U4	Block U5	Block U6
Number of scaled items	Total	15	17	15	15
	Multiple choice	5	7	6	3
	Dichotomously scored constructed-response	3	5	2	1
	Polytomously scored constructed-response	7	5	7	11
Unweighted sample size	†	2,100	2,100	2,300	2,200
Weighted average item score¹	†	.32	.49	.49	.31
Weighted average polyserial	†	.54	.53	.54	.50
Weighted alpha reliability	†	.67	.71	.72	.71
Weighted proportion of students attempting last item²	†	.85	.99	.94	.96
† 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 Music Assessment.

Last updated 18 March 2022 (PG)

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