Power Analysis – with Piface

Often in the planning stages researchers will need to consider questions about effect and sample sizes needed to support their project and estimation/modeling tasks. Many funding agencies will require justification of sample size planning with Statistical Power methods. Careful attention to such matters is often not an easy task. Good software is necessary but not sufficient. Asking the right discipline specific questions concerning useful effect sizes is just as important. Various software solutions abound on the internet addressing Power Analysis. Piface is a useful no cost solution to many Power Analysis problem settings. Piface and useful commentary can be found at:
http://www.stat.uiowa.edu/~rlenth/Power/