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

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

Block-level descriptive statistics as defined after scaling, grade 8 music national assessment, by block and school type: 2016
StatisticType of school1Block U3
Block U4
Block U5
Block U6
Number of scaled items†15171515
Unweighted sample size
Public2,0002,0002,0002,000
Nonpublic200200300200
Weighted average item score2
Public.32.48.49.31
Nonpublic.38.54.54.35
Weighted average polyserialPublic.54.53.55.50
Nonpublic.48.53.51.46
Weighted alpha reliabilityPublic.68.71.72.71
Nonpublic.55.71.66.63
Weighted proportion of students attempting last item3
Public.85.99.93.96
Nonpublic.811.00.97.97

† 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.
3The "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 01 April 2022 (ML)
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