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Educational and Psychological Measurement
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Simplified Determinations of Statistical Power, Magnitude of Effect and Research Sample Sizes

Herbert Friedman

College of William and Mary

A concise table based on a general measure of magnitude of effect is presented. This table allows direct determinations of statistical power over a practical range of values and alpha levels. The table also facilitates the setting of the research sample size needed to provide a given degree of power.

Educational and Psychological Measurement, Vol. 42, No. 2, 521-526 (1982)
DOI: 10.1177/001316448204200214
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