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| Academic Ability | 1 |
| Achievement Tests | 1 |
| Bayesian Statistics | 1 |
| Difficulty Level | 1 |
| Elementary Secondary Education | 1 |
| Error of Measurement | 1 |
| Latent Trait Theory | 1 |
| Scoring | 1 |
| Statistical Bias | 1 |
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| Journal of Educational… | 1 |
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| Camilli, Gregory | 1 |
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Peer reviewedCamilli, Gregory – Journal of Educational Statistics, 1988
The phenomenon of scale shrinkage is examined. Focus is on the pattern of decreasing variances in item response theory scale scores from fall to spring within a grade. It is demonstrated that questions concerning population distributions of true ability can be addressed with empirical Bayes techniques. (TJH)
Descriptors: Academic Ability, Achievement Tests, Bayesian Statistics, Difficulty Level
