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WebPower
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WebPower is free online software for estimating sample size or determining the power of a statistical test. WebPower is a collection of tools for conducting statistical power analysis online. WebPower can be used by anyone for free. Different from many other software for sample size planning and power analysis, WebPower can be used directly within a web browser and can also be used on mobile devices. Statistical power curve can also be generated. WebPower utilizes R for power calculation. Current allowed statistical power analysis by WebPower * Correlation ** Correlation based on Z-test * Proportion ** One sample proportion ** Two sample proportion, equal sample size ** Two sample proportion, unequal sample size * Mean ** Power of t-test ** Power of unbalanced two-sample t-test ** One-way ANOVA ** Two-way and three-way ANOVA with interaction ** Repeated-measures ANOVA * Regression ** Linear regression |
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