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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 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 permitted [R3]): 2001
Grade Number of initial
group-defining contrasts2		 Number of
principal
components2		 Proportion1 of scale score variance
Democracy3 Cultures4 Technology5 World role6
4 870 307 0.59 0.58 0.60 0.63
8 1,031 366 0.57 0.60 0.61 0.61
12 762 291 0.55 0.56 0.59 0.56
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.
Last updated 20 February 2008 (TS)

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