Proportion of Scale Score Variance Accounted for by the Population-Structure Model, Civics National Assessment, by Grade: 2014

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, Civics National Assessment, by Grade: 2014

NAEP Technical DocumentationProportion of scale score variance accounted for by the population-structure model, civics national assessment, by grade: 2014
Grade	Number of initial conditioning contrasts²	Number of principal components²	Proportion¹ of scale score variance
Grade	Number of initial conditioning contrasts²	Number of principal components²	One scale
¹ (Total Variance – Residual Variance)/Total Variance, where Total Variance consists of sampling, measurement, and other sources of error. ² Excluding the constant term. NOTE: Single overall scale. In 2014, grades 4 and 12 were not assessed. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2014 Civics Assessment.
8	2208	442	.68

Last updated 31 August 2021 (ML)