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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, Science National Assessment, by Scale and Grade: 2019
NAEP Technical DocumentationProportion of Scale Score Variance Accounted for by the Population-Structure Model, Science National Assessment, by Scale and Grade: 2019
| Grade | Number of initial conditioning contrasts | Number of principal components | Proportion of scale score variance | |||
|---|---|---|---|---|---|---|
| Univariate scale | Physical science | Earth and space sciences | Life science | |||
| (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. | ||||||
| DBA = Digitally based assessment. | ||||||
| U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2019 Science Assessment. | ||||||
| 4 | 1986 | 617 | .65 | .65 | .68 | .62 |
| 8 | 2215 | 645 | .66 | .64 | .65 | .67 |
| 12 | 2097 | 611 | .70 | .70 | .68 | .70 |
| Grade | Number of initial conditioning contrasts | Number of principal components | Proportion of scale score variance | |||
|---|---|---|---|---|---|---|
| Univariate scale | Physical science | Earth and space sciences | Life science | |||
| (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. | ||||||
| PBA = Paper-based assessment. | ||||||
| U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2019 Science Assessment. | ||||||
| 4 | 1986 | 600 | .64 | .65 | .69 | .61 |
| 8 | 2215 | 639 | .67 | .69 | .68 | .68 |
| 12 | 2097 | 610 | .73 | .76 | .73 | .73 |
Last updated 05 October 2023 (SK)