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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, Reading Combined National and State Assessment, by Subscale and Grade: 2022
NAEP Technical DocumentationProportion of Scale Score Variance Accounted for by the Population-Structure Model, Reading Combined National and State Assessment, by Subscale and Grade: 2022
| Grade | Number of initial conditioning contrasts | Number of principal components and contrast-coded direct covariates | Proportion of scale score variance | |
|---|---|---|---|---|
| Literary | Informational | |||
| (Total Variance – Residual Variance) / Total Variance, where Total Variance includes variance accounted and unaccounted for by the variables in the population-structure model. | ||||
| Excluding the constant term. | ||||
| In 2022, grade 12 was not assessed. | ||||
| U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2022 Reading Assessment. | ||||
| 4 | 2203 | 699 | .63 | .66 |
| 8 | 2572 | 783 | .60 | .63 |
Last updated 24 July 2024 (SK)