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 | 0.96- 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), 2008 Mathematics Long-Term Trend Assessment. |
|||||||||
All contrasts | 557 | 0.90 | 0.61 | 0.99 | 20 | 27 | 178 | 175 | 157 |
Student questionnaire | 60 | 0.89 | 0.63 | 0.99 | 7 | 4 | 8 | 22 | 19 |
Major reporting variables | 63 | 0.90 | 0.66 | 0.99 | 1 | 7 | 24 | 10 | 21 |
Interactions between reporting variables | 391 | 0.90 | 0.61 | 0.99 | 12 | 13 | 134 | 129 | 103 |
SD/ELL questionnaire | 43 | 0.91 | 0.76 | 0.98 | 0 | 3 | 12 | 14 | 14 |