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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 Civics National Assessment: 2010
| Type of contrast | Number of contrasts | Mean | Minimum | Maximum | Number of contrasts by proportion1 of variance explained | ||||
|---|---|---|---|---|---|---|---|---|---|
| 0.00 - 0.70 | 0.70 - 0.80 | 0.80 - 0.90 | 0.90 - 0.95 | 0.95 - 1.00 | |||||
| 1 (Total Variance – Residual Variance)/Total Variance, where Total Variance consists of both sampling and measurement error variance. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2010 Civics Assessment. |
|||||||||
| All contrasts | 1055 | 0.90 | 0.64 | 0.99 | 15 | 62 | 395 | 337 | 246 |
| Student questionnaire | 233 | 0.88 | 0.64 | 0.99 | 6 | 38 | 75 | 78 | 36 |
| Major reporting variables | 61 | 0.91 | 0.77 | 0.99 | 0 | 3 | 24 | 13 | 21 |
| Interactions between reporting variables | 442 | 0.91 | 0.66 | 0.99 | 9 | 21 | 114 | 146 | 152 |
| School questionnaire | 286 | 0.90 | 0.83 | 0.99 | 0 | 0 | 166 | 90 | 30 |
| SD/ELL questionnaire | 33 | 0.90 | 0.81 | 0.97 | 0 | 0 | 16 | 10 | 7 |
Last updated 05 January 2016 (GF)
