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

NAEP Technical DocumentationBlock-Level Descriptive Statistics as Defined After Scaling, Grade 8 Visual Arts National Assessment, by Block and School Type: 2016

Block-level descriptive statistics as defined after scaling, grade 8 visual arts national assessment, by block and school type: 2016
Statistic	Type of school¹	Block V3	Block V4	Block V5	Block V6
Number of scaled items	†	6	12	9	6
Unweighted sample size	Public	2,000	2,000	2,000	2,000
Unweighted sample size	Nonpublic	200	200	300	200
Weighted average item score²	Public	.41	.48	.43	.49
Weighted average item score²	Nonpublic	.52	.50	.52	.56
Weighted average polyserial	Public	.59	.51	.56	.60
Weighted average polyserial	Nonpublic	.55	.52	.53	.56
Weighted alpha reliability	Public	.50	.68	.59	.43
Weighted alpha reliability	Nonpublic	.44	.64	.52	.33
Weighted proportion of students attempting last item³	Public	.74	.84	.73	1.00
Weighted proportion of students attempting last item³	Nonpublic	.75	.91	.83	1.00
† Not applicable. ¹ Nonpublic school sample includes only private schools, including Catholic schools. BIE and DoDEA schools are not included in either the public or nonpublic category. ² 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. 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 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 06 April 2022 (ML)

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