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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, Science Combined National and State Assessment, by Scale and Grade: 2015
NAEP Technical Documentation Proportion of Scale Score Variance Accounted for by the Population-Structure Model, Science Combined National and State Assessment, by Scale and Grade: 2015
| Grade | Number of initial conditioning contrasts2 | Number of principal components2 | Proportion of scale score variance1 | |||
|---|---|---|---|---|---|---|
| Composite3 | Physical science | Earth science | Life science | |||
| 4 | 3042 | 948 | .59 | .62 | .63 | .54 |
| 8 | 2966 | 882 | .62 | .64 | .63 | .62 |
| 12 | 2545 | 532 | .66 | .70 | .67 | .66 |
|
1 (Total Variance – Residual Variance) / Total Variance, where Total Variance consists of sampling, measurement, and other sources of error. 2 Excluding the constant term. 3 Single overall scale. NOTE: Science was only assessed at the national level at grade 12 in 2015. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2015 Science Assessment. | ||||||
Last updated 30 November 2021 (ML)