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, Geography National Assessment, By Scale and Grade: 2010

NAEP Technical DocumentationProportion of scale score variance accounted for by the population-structure model, geography national assessment, by scale and grade: 2010

Grade	Number of initial conditioning contrasts1	Number of principal components1	Proportion2 of scale score variance
			Space and place	Environment and society	Spatial dynamics and connections
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), 2010 Geography Assessment.
4	2674	425	0.60	0.65	0.65
8	3078	476	0.67	0.67	0.74
12	2737	367	0.65	0.65	0.68

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