
NCSS PASS is a robust software package that provides a comprehensive range of sample-size determination capabilities to meet your statistical needs. With over a thousand scenarios for statistical tests and confidence intervals, it beats all other sample size determination tools on the market. Each PASS tool was meticulously designed and rigorously evaluated against published studies and texts to ensure correctness and dependability.
Whether you’re conducting clinical trials, pharmaceutical research, or other medical research, the application offers a range of features to meet your specific needs.

Features:
- PASS has an easy-to-use UI that even intermediate users can understand. To navigate the application correctly, you do not need to be a statistician, although English proficiency is required. An intuitive GUI will guide you through the procedure, allowing you to focus on your study rather than getting bogged down in intricate technical details.
- The application provides an unrivalled library of sample size computations for a variety of statistical tests and confidence intervals. Whether you need to calculate the best sample size for hypothesis testing, correlation analysis, survival research, or other statistical scenarios, the software can help.
- The PASS authors have spent more than 25 years perfecting and fine-tuning their software. Each tool has been rigorously validated in extensive research to ensure that its findings are consistent with the scientific literature. You may be confident that your sample size calculations are accurate.
- The client creates publication-quality reports, allowing you to convey your findings with clarity and professionalism. These reports can be converted to PDF or Word formats, making them suitable for use in research papers, presentations, and grant applications.
- One of PASS’s distinguishing features is interactive power analysis. It enables the investigation of “what-if” scenarios, allowing evaluation of the impact of various parameters on a study’s statistical power. This adaptability improves experimental design and decision-making.
- Whether you’re working with t-tests, chi-square tests, ANOVA, linear regression, or other statistical tests, PASS gives you the tools you need to compute the appropriate sample size quickly. The software supports a wide range of statistical approaches, ensuring you find the best analysis for your research needs.

