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

Bernard S. Gorman · Louis H. Primavera · David B. Allison

33 citations0/0 files storedEducational and Psychological Measurement

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Meta-analysis and systematic reviews Statistical Methods in Clinical Trials Statistical Methods in Epidemiology

Abstract

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.

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1992A power primer.1962The statistical power of abnormal-social psychological research: A review.1990Design Sensitivity: Statistical Power for Experimental Research.1989Do studies of statistical power have an effect on the power of studies?1982Simplified Determinations of Statistical Power, Magnitude of Effect and Research Sample Sizes

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2005Self-Help Treatment for Insomnia: a Randomized Controlled Trial 1997Power and money: Designing statistically powerful studies while minimizing financial costs.2003Effects of Traditional Versus Learning-Styles Instructional Methods on Middle School Students

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