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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 and Grade, U.S. History National Main Assessment (Accommodations Not Permitted ): 2001

NAEP Technical DocumentationProportion of scale score variance accounted for by the population-structure model and grade, U.S. history national main assessment (accommodations not permitted [R2]): 2001

Grade	Number of initial group-defining contrasts2	Number of principal components2	Proportion1 of scale score variance
			Democracy3	Cultures4	Technology5	World role6
4	870	299	0.58	0.58	0.59	0.63
8	1,031	356	0.54	0.57	0.61	0.58
12	762	285	0.53	0.54	0.57	0.54
1 Proportion is (Total Variance – Residual Variance)/Total Variance. 2 Excluding the constant term. 3 Change and Continuity in American Democracy: Ideas, Institutions, Practices, and Controversies. 4 The Gathering of Interactions of Peoples, Cultures, and Ideas. 5 Economic and Technological Changes and Their Relation to Society, Ideas, and the Environment. 6 The Changing Role of America in the World. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2001 U.S. History Assessment.

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