NAEP tdw - Proportion of Scale Score Variance Accounted for by the Population-Structure Models, Reading Combined National and State Assessment, By Subscale and Grade: 2013

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 Assessment, By Subscale and Grade: 2013

NAEP Technical DocumentationProportion of scale score variance accounted for by the population-structure model, reading combined national and state assessment, by subscale and grade: 2013
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	Literary	Information
¹(Total Variance – Residual Variance)/Total Variance, where Total Variance consists of sampling, measurement, and other sources of error. ²Excluding the constant term. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2013 Reading Assessment.
4	2232	667	.57	.59
8	2344	670	.54	.56
12	2181	503	.63	.63

Last updated 21 May 2017 (DC)