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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 Economics National Assessment: 2012
| 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.
NOTE: SD/ELL = Students with disabilities/English language learners. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2012 Economics Assessment. |
|||||||||
| All contrasts | 1083 | 0.90 | 0.67 | 0.99 | 6 | 43 | 440 | 441 | 153 |
| Student questionnaire | 60 | 0.89 | 0.74 | 0.98 | 0 | 5 | 24 | 19 | 12 |
| Major reporting variables | 241 | 0.91 | 0.74 | 0.99 | 0 | 9 | 72 | 103 | 57 |
| Interactions between reporting variables | 414 | 0.89 | 0.67 | 0.98 | 6 | 29 | 153 | 171 | 55 |
| Department head questionnaire | 62 | 0.90 | 0.86 | 0.95 | 0 | 0 | 32 | 30 | 0 |
| School questionnaire | 274 | 0.90 | 0.82 | 0.99 | 0 | 0 | 145 | 105 | 24 |
| SD/ELL questionnaire | 32 | 0.89 | 0.80 | 0.97 | 0 | 0 | 14 | 13 | 5 |
Last updated 01 July 2014 (GF)