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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: 2017
NAEP Technical DocumentationProportion 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: 2017
| 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 | 1554 | .90 | .62 | 1.00 | 9 | 96 | 585 | 498 | 366 |
| Student questionnaire | 324 | .93 | .73 | .99 | 0 | 9 | 69 | 111 | 135 |
| Major reporting variables | 316 | .90 | .62 | 1.00 | 1 | 17 | 139 | 96 | 63 |
| Interactions between reporting variables | 172 | .88 | .62 | .98 | 8 | 13 | 67 | 60 | 24 |
| Teacher questionnaire | 414 | .90 | .73 | .99 | 0 | 27 | 155 | 124 | 108 |
| School questionnaire | 294 | .89 | .72 | .98 | 0 | 20 | 146 | 99 | 29 |
| SD/EL questionnaire | 34 | .87 | .75 | .99 | 0 | 10 | 9 | 8 | 7 |
|
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), 2017 Reading Assessment. | |||||||||
Last updated 11 May 2022 (SK)