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Educational and Psychological Measurement
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It is Time to Bury the Spearman-Brown "Prophecy" Formula for Some Common Applications

Richard A. Charter

V.A. Long Beach Healthcare System

The restrictive assumption of classical parallelism for the Spearman-Brown formulas makes them obsolete when the two-part alpha and coefficient alpha formulas can be used. The alpha coefficients require the less restrictive assumption of essential tau-equivalence. Even small reliability differences produced by the Spearman-Brown and alpha coefficient formulas on the same data can result in large applied differences.

Educational and Psychological Measurement, Vol. 61, No. 4, 690-696 (2001)
DOI: 10.1177/00131640121971446
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