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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 Models, Reading Combined National and State Main Assessment, by Grade: 2002
NAEP Technical DocumentationProportion of scale score variance accounted for by the population-structure models, by grade, reading combined national and state main assessment: 2002
Grade Number of initial
group-defining contrasts1		 Number of
principal components1		 Proportion of scale score variance
Reading for literary experience Reading
to gain information		 Reading to perform a task
4 1,486 499 0.46 0.48 †
8 1,679 565 0.47 0.52 0.56
12 1,061 308 0.52 0.47 0.53
† The NAEP reading assessment does not assess the "reading to perform a task" scale at grade 4.
1 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), 2002 Reading Assessment.
Last updated 13 February 2009 (GF)

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