Sample Size & Power
PASS software provides sample size tools for over 650 statistical test and confidence interval scenarios. Each tool has been carefully validated with published articles and/or texts.
Get to know PASS by downloading a free trial, viewing the video to the right, or exploring this website.
PASS has been fine-tuned for over 20 years, and has become the leading sample size software choice for clinical trial, pharmaceutical, and other medical research. It has also become a mainstay in all other fields where sample size calculation or evaluation is needed.
- Obtaining A Sample Size
- Choosing A Procedure
- Enter The Values
- Ready to Use Output