PASS software is used by researchers to determine the sample size needed for a study involving a statistical test or confidence interval. It may also be used to analyze the statistical power of a study.

PASS can be used to analyze sample size for over 680 statistical test and confidence interval scenarios. PASS comes with PhD statistician support, as well as complete documentation with examples and validation of every procedure.

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The NCSS statistical analysis and graphics application provides hundreds of statistical tools to analyze and visualize your data. It has been fine-tuned and developed for over 30 years. NCSS can import all the major data types, and filters and transformations are easy to apply.

You can quickly get to know NCSS by watching the product information and training videos, or you can download a 30-day trial, or view the website materials and documentation.

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"Two reasons for choosing your product [PASS]: all-around methods and options + very good documentation."

Mika Kurkilahti, PhD

"I had been using [another statistical software package] for over 15 years until recently when I noticed it would not run ANOVAs correctly. After researching numerous options I switched to NCSS and PASS and couldn't be happier. Your product is accurate, fast, easy to use, and very inexpensive. And thanks to the software’s flexibility in reporting and graphing, it has made my consulting business easier as well. Thank you!"

Ken Hansen, M.S., Mechanical Engineer and Applied Statistician