Download Free Trial Software
The free trial installation will install a copy of the program, a PDF copy of the manual, and a PDF quick start guide.
The evaluation runs for 10 days OR 10 trials, whichever comes first.
Opening/closing the program equals 1 trial.
To run the program on a Mac, a Windows emulator is necessary such as Parallels or Bootcamp. Using Wine or CrossOver is not recommended.
Complete the form below to receive the download. A valid e-mail is required so that we can send you a download link.

"In summary, this software was obviously developed by those who have conducted power analyses for numerous proposals. The authors are well aware of the "What ifs?" that we are asked, and that we ask of ourselves, as we conduct power analyses as a part of planning trials. With its great flexibility and speed, this nicely designed software would be well used by anyone involved in the design of clinical trials and other research projects."
Dr. Andrew Leon - Software Review, Controlled Clincal Trials, 20:202-204 (1999)
Power and Precision

Power and Precision is a statistical power analysis software package for calculation of a sample size for a planned study. The program features an unusually clear interface, and many tools to assist the user in developing an understanding of power analysis.