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Java Applets for Power and Sample Size

By Russ Lenth

Statistics and Actuarial Science Department, University of Iowa

This is a Java application that allows you to do power and sample-size calculations for a number of standard statistical models.

Listed in Teaching Materials

Version 1.0 - published on 30 Oct 2018 doi:10.25334/Q4M71Q - cite this

Licensed under these terms



The software is intended to be useful in planning statistical studies. It is not intended to be used for analysis of data that have already been collected.

Each menu selection provides a graphical interface for studying the power of one or more tests. The dialog windows include sliders (convertible to number-entry fields) for varying parameters, and a simple provision for graphing one variable against another. Each dialog window also offers a Help menu (on Macs, the Options and Help menus are added at the top of the screen). Please read the Help menus before contacting me with questions.

The “Balanced ANOVA” option provides another dialog with a list of several popular experimental designs, plus a provision for specifying your own model.


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