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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 Variance Accounted for by Principal Components Used in NAEP Population-Structure Models → Proportion of Variance of the Group-Defining Contrasts Accounted for by the Principal Components Used in the Population-Structure Model, Grade 12 Reading National Assessment, by Type of Contrast: 2015
NAEP Technical Documentation Proportion of Variance of the Group-Defining Contrasts Accounted for by the Principal Components Used in the Population-Structure Model, Grade 12 Reading National Assessment, by Type of Contrast: 2015
| Type of contrast | Number of contrasts | Mean | Minimum | Maximum | Number of contrasts by proportion of variance explained1 | ||||
|---|---|---|---|---|---|---|---|---|---|
| .00 - .70 | .70 - .80 | .80 - .90 | .90 - .95 | .95 - 1.00 | |||||
| All contrasts | 1300 | .90 | .63 | .99 | 10 | 46 | 565 | 499 | 180 |
| Student questionnaire | 225 | .88 | .65 | .98 | 3 | 21 | 93 | 84 | 24 |
| Major reporting variables | 59 | .92 | .70 | .99 | 0 | 2 | 20 | 11 | 26 |
| Interactions between reporting variables | 326 | .89 | .63 | .98 | 7 | 20 | 109 | 150 | 40 |
| School questionnaire | 658 | .91 | .84 | .99 | 0 | 0 | 328 | 244 | 86 |
| SD/EL questionnaire | 32 | .88 | .78 | .97 | 0 | 3 | 15 | 10 | 4 |
|
1 (Total Variance – Residual Variance) / Total Variance, where Total Variance consists of sampling, measurement, and other sources of error.
NOTE: SD/EL = Students with disabilities/English learners. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2015 Reading Assessment. | |||||||||
Last updated 30 November 2021 (ML)