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Gain score

1 byte added, 18:38, 28 September 2014
Case of correlated measurement errors
===Case of correlated measurement errors===
If the measurement errors on the pretest and posttest are positively correlated (for instance, a student may be unaware of an English word that hampers his ability to do a particular test item on both pretest and posttest), then the measurement error for the gain score would be correspondingly less. In the perfect situation where both measurement errors are perfectly correlated, the gain score is completely reliable.
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