Request an unlock code
Complete the form below to receive your unlock code.
To retrieve your computer ID, open the program, click "I want to get an unlock code", and copy the 7 digit number provided. We will send the unlock code to your e-mail.
Business hours are M-F 9:00 AM ET - 5:00 PM ET.
This is a manual verification process; messages received outside of business hours will receive a response the next business day.
*If your request does not go through, please send the 7 digit computer ID and your receipt number to [email protected].
Important: Hours of Operation
Business hours are M-F 9:00 AM ET - 5:00 PM ET.
This is a manual verification process.
"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.