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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: 2015
NAEP Technical Documentation Proportion of Scale Score Variance Accounted for by the Population-Structure Model, Mathematics Combined National and State Assessment, by Subscale and Grade: 2015
| Grade | Number of initial conditioning contrasts2 | Number of principal components2 | Proportion of scale score variance1 | ||||
|---|---|---|---|---|---|---|---|
| Number properties and operations | Measurement | Geometry | Data analysis, statistics, and probability | Algebra | |||
| 4 | 3695 | 1004 | .58 | .59 | .56 | .60 | .56 |
| 8 | 3589 | 907 | .64 | .64 | .60 | .61 | .68 |
| 12 | 2777 | 576 | .76 | .75 | .75 | .78 | |
|
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: Since 2005, measurement and geometry are 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), 2015 Mathematics Assessment. | |||||||
Last updated 30 November 2021 (ML)
