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Power/Sample size calculator logo
Power/Sample size calculator
Category: Statistical distribution
Subcategories: Power , StatPages

This screen computes the sample size required to detect a difference between two proportions. Registration not required.

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Power & Sample Size Clinical trials logo
Power & Sample Size Clinical trials
Category: Statistical distribution
Subcategories: Power , clinical trials

Online calculation for sample size, power or the minimal detectable difference for parallel studies, crossover studies, or studies to find associations between variables, where the dependent variable is Success or Failure, a Quantitative Measurement, or a time to an event such as a survival time. Registration not required.

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Power and sample size Java applets logo
Power and sample size Java applets
Category: Statistical distribution
Subcategories: Power

This page from RV Lenth provides graphical interfaces for studying the power of one or more tests. They include sliders (convertible to number-entry fields) for varying parameters, and a simple provision for graphing one variable against another. Registration not required.

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