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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 4 Reading Combined National and State Main Assessment: 2009
| Type of contrast | Number of contrasts | Mean | Minimum | Maximum | Number of contrasts by proportion1 of variance explained | ||||
|---|---|---|---|---|---|---|---|---|---|
| 0.00 - 0.70 | 0.71 - 0.80 | 0.81 - 0.90 | 0.91 - 0.95 | 0.95 - 1.00 | |||||
| All contrasts | 2,734 | 0.90 | 0.60 | 1.00 | 10 | 110 | 1204 | 777 | 633 |
| 1(Total Variance – Residual Variance)/Total Variance, where Total Variance consists of both sampling and measurement error variance. NOTE: NIES = National Indian Education Study; 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), 2009 Reading Assessment. |
|||||||||
| Student questionnaire | 149 | 0.91 | 0.60 | 0.99 | 1 | 7 | 41 | 61 | 39 |
| Major reporting variables | 109 | 0.93 | 0.69 | 1.00 | 1 | 0 | 27 | 35 | 46 |
| Interaction between reporting variables | 462 | 0.91 | 0.61 | 0.99 | 5 | 27 | 110 | 150 | 170 |
| Teacher questionnaire | 966 | 0.90 | 0.72 | 0.99 | 0 | 40 | 435 | 253 | 238 |
| School questionnaire | 704 | 0.89 | 0.77 | 0.99 | 0 | 6 | 404 | 220 | 74 |
| NIES questionnaire | 300 | 0.87 | 0.64 | 0.99 | 3 | 28 | 175 | 52 | 42 |
| SD/ELL questionnaire | 44 | 0.92 | 0.78 | 0.99 | 0 | 2 | 12 | 6 | 24 |
Last updated 05 January 2016 (GF)
