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

NAEP Technical DocumentationProportion of scale score variance accounted for by the population-structure model, geography national assessment, by subscale and 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	Space and place	Environment and society	Spatial dynamics and connections
¹ (Total Variance – Residual Variance)/Total Variance, where Total Variance consists of sampling, measurement, and other sources of error. ² Excluding the contant term. NOTE: 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 Geography Assessment.
8	2208	440	.68	.70	.73

Last updated 30 August 2021 (ML)