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Educational and Psychological Measurement
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POWPAL: A Program for Estimating Effect Sizes, Statistical Power, and Sample Sizes

Bernard S. Gorman

Nassau Community College and Hofstra University

Louis H. Primavera

Saint John's University

David B. Allison

Obesity Research Center St. Luke's/Roosevelt Hospital Columbia University College of Physicians and Surgeons

POWPAL is a simple, interactive computer program that computes effect sizes and power estimates from summary statistics. Additionally, the program provides estimates of future sample sizes needed for various combinations of power, significance levels, and effect sizes.

Educational and Psychological Measurement, Vol. 55, No. 5, 773-776 (1995)
DOI: 10.1177/0013164495055005009
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