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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 Models → Proportion of Scale Score Variance Accounted for by the Population-Structure Model, Grade 4 Reading National Main Assessment (Accommodations Not Permitted): 2000

NAEP Technical DocumentationProportion of scale score variance accounted for by the population-structure model, grade 4 reading national main assessment (accommodations not permitted [R2]): 2000

Number of initial group-defining contrasts2	Number of principal components2	Proportion1 of scale score variance
		Reading for literary experience	Reading to gain information
1,117	385	0.70	0.68
1 Proportion is (Total Variance – Residual Variance)/Total Variance. 2 Excluding the constant term.
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2000 Reading Assessment.

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