- Surveys & Programs
- Data & Tools
- Fast Facts
- News & Events
- Publications & Products
- About Us
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 of the Group-Defining Contrasts Accounted for by the Principal Components Used in NAEP Student Group Distribution Models → Proportion of Variance of the Group-Defining Contrasts Accounted for by the Principal Components Used in the Population-Structure Model, Grade 8 Mathematics Combined National and State Main Assessment: 2003
| Type of contrast | Number of contrasts | Mean | Minimum | Maximum | Number of contrasts by proportion of variance explained | ||||
|---|---|---|---|---|---|---|---|---|---|
| 0.00 - 0.70 | 0.70 - 0.80 | 0.80 - 0.90 | 0.90 - 0.95 | 0.95 - 1.00 | |||||
| SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2003 Mathematics Assessment. | |||||||||
| All contrasts | 1396 | 0.90 | 0.55 | 0.99 | 15 | 85 | 463 | 511 | 322 |
| Student questionnaire | 169 | 0.89 | 0.55 | 0.99 | 4 | 23 | 52 | 39 | 51 |
| Major reporting variables | 102 | 0.92 | 0.73 | 0.99 | 0 | 4 | 22 | 34 | 42 |
| Interactions between reporting variables | 800 | 0.91 | 0.63 | 0.98 | 1 | 30 | 237 | 340 | 192 |
| Teacher questionnaire | 81 | 0.86 | 0.61 | 0.98 | 9 | 5 | 27 | 31 | 9 |
| School questionnaire | 244 | 0.88 | 0.68 | 0.98 | 1 | 23 | 125 | 67 | 28 |
Last updated 25 March 2009 (RF)
