The Bayesian Approach to Sample Size Calculations
Sample Size determination is generally done using a frequentist approach. However, Bayesian approaches can also be used allowing a researcher to take into account prior information as well as handle uncertainty about parameters used in the frequentist approach.
Using Pilot Studies in Clinical Research
A pilot study is a smaller version of a planned study. The purpose of the pilot study is to test the design of the larger study to improve its likelihood of success. Unfortunately, there are several misconceptions about what a pilot study is for.