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Educational and Psychological Measurement
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Approximation of Probabilities Near the Median of the F Distribution

Alfred L. Brophy

Guidance Exchange, West Chester, Pennsylvania

Jaspen has provided a fairly accurate and widely used method of approximating probabilities corresponding to values of the F ratio. However, the approximation is inaccurate when F is between unity and the median. A minor modification of the method provides more nearly accurate estimates of the probabilities for F values in this range than those afforded by Jaspen's procedure. Changes are suggested in Jaspen's computer program for calculating the probabilities.

Educational and Psychological Measurement, Vol. 43, No. 1, 177-180 (1983)
DOI: 10.1177/001316448304300124
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