Sample Size Software

PASS is the world-wide leading software tool for determining sample size. As the leader in sample size technology, PASS performs power analysis and calculates sample sizes for over 650 statistical test and confidence interval scenarios.

Statistical Analysis & Graphics Software

NCSS software provides a complete, easy-to-use collection of hundreds of statistical and graphics tools to analyze and visualize your data. NCSS is accurate, comprehensive, intuitive, and well-documented.

Statistical, Graphics, and Sample Size Software

For over 30 years, we at NCSS have been dedicated to providing researchers, investigators, academics, scientists, and other professionals with quality statistical software that is comprehensive and accurate, but still intuitive and easy to use.

Our two products, NCSS and PASS, are used world-wide by researchers in many industries. They are used by individual professionals and academics, as well as in collaborative efforts within large institutions.

All software purchases from NCSS come with full PhD statistician support, by phone or by email. Also, free training videos are available through this website.

Each procedure is carefully documented with technical details, examples, annotated output, references, formulas, and other details. The documentation can be viewed on this website, or through the help system that is integrated into the software.

To get to know NCSS and PASS, you can watch our product features or demonstration videos, download a trial of the software, or read more about each product on this site. We sincerely feel that these tools will quickly give you your needed answers simply and accurately.

PASS13: PASS (Power Analysis and Sample Size) is the premier software tool for determining the needed sample size or analyzing the power of a study. PASS is used extensively in clinical trial planning, grant proposals, pharmaceutical research, statistical and biostatistical consulting, health research, and many other areas of study planning and study evaluation.

Each 'procedure' in PASS corresponds to a specific statistical test or confidence interval. To use PASS, the investigator need only open the desired procedure, specify a handful of necessary parameters, and run the procedure. Carefully crafted option notes guide the user in the choice of each parameter. The results are given with references, output descriptions, and sample size summary paragraphs.

NCSS10: As an all-purpose statistical program, NCSS is used in a variety of industries: from medical investigation and business analytics, to engineering, quality control, and academic research.

The tools in NCSS are very intuitive. Data is easily imported, copied-and-pasted, or entered directly. Meaningful analysis of the data is straightforward, with examples and complete documentation for every tool.

With NCSS, it is easy to produce clear, fully-customized graphics for a variety of charts and graphs. All results are ready to be viewed, printed, saved, or pasted into presentation or word processing software.

Publications Citing NCSS and PASS

Gastrointestinal Endoscopy
Experimental & Clinical Cardiology
American Heart Journal
American Journal of Transplantation
Annals of Internal Medicine
American Journal of Surgery
Journal of Hepatology
American Heart Association
Journal of Cardiovascular Electrophysiology
Bone Marrow Transplantation
International Journal of Gynecology Obstetrics
The Journal of Urology
The American Journal of Medicine

"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

"PASS 13 is fantastic! Better than my new dishwasher and microwave combined."

Dr. Barbara Tabachnick, CSUN, Author