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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 , Economics National Assessment, by Grade: 2006
| Grade | Number of initial group-defining contrasts2 |
Number of principal component2 | Proportion1 of scale score variance accounted for by the population-structure model | ||
|---|---|---|---|---|---|
| Market Economy | National Economy | International Economy | |||
| 1 (Total Variance – Residual Variance)/Total Variance, where Total Variance consists of both sampling and measurement error variance. 2 Excluding the constant term. NOTE: Only grade 12 students took the economics assessment. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2006 Economics Assessment. |
|||||
| 12 | 2876 | 414 | 0.61 | 0.65 | 0.61 |
Last updated 04 May 2010 (JL)
