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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 Model → Proportion of Scale Score Variance Accounted for by the Population-Structure Model, Reading Combined National and State Main Assessment, by Scale and Grade: 2007
| Grade | Number of initial group-defining contrasts2 |
Number of principal components2 | Proportion1 of scale score variance by the population-structure model | ||
|---|---|---|---|---|---|
| Literary | Information | Task | |||
| † Not applicable. 1 (Total Variance – Residual Variance)/Total Variance, where Total Variance consists of both sampling and measurement error variance. 2 Excluding the constant term. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2007 Reading Assessment. |
|||||
| 4 | 3187 | 617 | 0.47 | 0.50 | † |
| 8 | 3598 | 669 | 0.49 | 0.54 | 0.58 |
Last updated 04 May 2010 (JL)
