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Direct linkWang, Wen-Chung – Applied Psychological Measurement, 2008
Raju and Oshima (2005) proposed two prophecy formulas based on item response theory in order to predict the reliability of ability estimates for a test after change in its length. The first prophecy formula is equivalent to the classical Spearman-Brown prophecy formula. The second prophecy formula is misleading because of an underlying false…
Descriptors: Test Reliability, Item Response Theory, Computation, Evaluation Methods
