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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 4 Reading Combined National and State 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 4 Reading Combined National and State 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 | 2432 | .90 | .66 | 1.00 | 7 | 78 | 1139 | 706 | 502 |
| Student questionnaire | 132 | .91 | .72 | .99 | 0 | 9 | 41 | 52 | 30 |
| Major reporting variables | 131 | .93 | .70 | 1.00 | 1 | 0 | 38 | 45 | 47 |
| Interactions between reporting variables | 281 | .89 | .66 | .97 | 5 | 15 | 100 | 125 | 36 |
| Teacher questionnaire | 897 | .91 | .77 | .99 | 0 | 20 | 416 | 213 | 248 |
| School questionnaire | 718 | .90 | .79 | .99 | 0 | 5 | 393 | 213 | 107 |
| NIES questionnaire | 237 | .87 | .70 | .99 | 1 | 28 | 138 | 50 | 20 |
| SD/EL questionnaire | 36 | .91 | .78 | .99 | 0 | 1 | 13 | 8 | 14 |
|
1 (Total Variance – Residual Variance) / Total Variance, where Total Variance consists of sampling, measurement, and other sources of error.
NOTE: NIES = National Indian Education Study. 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 26 November 2021 (ML)