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 12 Reading State Assessment, By Scale and Jurisdiction: 2009

NAEP Technical DocumentationProportion of scale score variance accounted for by the population-structure model, grade 12 reading state assessment: by scale and jurisdiction, 2009

Jurisdiction	Number of principal components	Proportion1 of scale score variance accounted for by the population-structure model
		Literary	Information
1 (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), 2009 Reading State Assessment.
Arkansas	206	0.68	0.68
Connecticut	201	0.64	0.68
Florida	206	0.53	0.58
Idaho	214	0.64	0.57
Illinois	195	0.61	0.65
Iowa	197	0.67	0.62
Massachusetts	207	0.61	0.65
New Hampshire	184	0.65	0.69
New Jersey	207	0.67	0.64
South Dakota	200	0.65	0.65
West Virginia	199	0.64	0.67

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