- Surveys & Programs
- Data & Tools
- Fast Facts
- News & Events
- Publications & Products
- About Us
Twitter
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 Science 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 Science 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 | 1407 | .90 | .68 | .99 | 3 | 61 | 592 | 555 | 196 |
| Student questionnaire | 349 | .88 | .68 | .98 | 2 | 40 | 151 | 106 | 50 |
| Major reporting variables | 58 | .92 | .77 | .99 | 0 | 1 | 21 | 16 | 20 |
| Interactions between reporting variables | 314 | .90 | .69 | .98 | 1 | 18 | 113 | 142 | 40 |
| School questionnaire | 654 | .91 | .85 | .99 | 0 | 0 | 289 | 281 | 84 |
| SD/EL questionnaire | 32 | .87 | .79 | .96 | 0 | 2 | 18 | 10 | 2 |
|
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 Science Assessment. | |||||||||
Last updated 30 November 2021 (ML)