NAEP Analysis and Scaling → Estimation of Population and Student Group Distributions → Examining the Population-Structure Models Used in NAEP → Proportion of Scale Score Variance Accounted for by the Population-Structure Model → Proportion of Scale Score Variance Accounted for by the Population-Structure Models, Grade 8 Arts Assessment: 2008

NAEP Technical DocumentationProportion of scale score variance accounted for by the population-structure models, grade 8 arts assessment: 2008

Grade	Number of initial group-defining contrasts1	Number of principal components1	Proportion2 of scale score variance
			1 Excluding the constant term. 2 (Total Variance – Residual Variance)/Total Variance, where Total Variance consists of both sampling and measurement error variance. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2008 Arts Assessment.
8	2,405	272	0.64

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