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Table of Contents | Search Technical Documentation | References
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, Mathematics Combined National and State Assessment, By Subscale and Grade: 2013
| Grade | Number of initial group-defining contrasts2 | Number of principal components2 | Proportion1 of scale score variance | ||||
|---|---|---|---|---|---|---|---|
| Number properties and operations | Measurement | Geometry | Data analysis, statistics, and probability | Algebra | |||
| 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: In 2013, measurement and geometry were combined at grade 12. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2013 Mathematics Assessment. | |||||||
| 4 | 2232 | 666 | .57 | .58 | .52 | .57 | .56 |
| 8 | 2410 | 723 | .63 | .62 | .60 | .63 | .66 |
| 12 | 2541 | 624 | .76 | .76 | .76 | .80 | |
Last updated 21 May 2017 (DC)