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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 8 Technology and Engineering Literacy (TEL) National Assessment: 2014
| Type of contrast | Number of contrasts | Mean | Minimum | Maximum | Number of contrasts by proportion1 of variance explained | ||||
|---|---|---|---|---|---|---|---|---|---|
| .00 - .70 | .70 - .80 | .80 - .90 | .90 - .95 | .95 - 1.00 | |||||
| Total | 1232 | .90 | .63 | 1.00 | 10 | 38 | 549 | 427 | 208 |
| Student questionnaire | 261 | .67 | .99 | .91 | 2 | 13 | 75 | 108 | 63 |
| Major reporting variables | 71 | .82 | 1.00 | .92 | 0 | 0 | 31 | 16 | 24 |
| Interactions between reporting variables | 338 | .63 | .98 | .89 | 8 | 20 | 115 | 148 | 47 |
| School questionnaire | 529 | .82 | .99 | .90 | 0 | 0 | 316 | 147 | 66 |
| SD/EL questionnaire | 33 | .76 | .98 | .89 | 0 | 5 | 12 | 8 | 8 |
|
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. In 2014, grades 4 and 12 were not assessed. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2014 TEL Assessment. | |||||||||
Last updated 30 August 2021 (ML)