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 680 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, NCSS has 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 solutions, NCSS 10 and PASS 14, are used world-wide by researchers in many industries and are renowned for accuracy, ease-of-use, graphical excellence and affordability. They are used by thousands of customers including 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 learn more about NCSS 10 and PASS 14, you can watch our product features or demo videos, download a trial of the software, or read more about each product on this site.

PASS 14 provides sample size calculations for over 330 more scenarios than any other sample size software and 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.

A robust statistical and graphics program, NCSS 10 is used in a variety of industries from medical investigation and business analytics, to engineering, quality control, and academic research. Learn why thousands of researchers, consultants, professionals, engineers, and scientists are using NCSS worldwide.


Publications Citing NCSS and PASS

International Urogynecology Journal
Clinical and Experimental Pharmacology and Physiology
Atherosclerosis
Annals of Oncology
The American Journal of Clinical Nutrition
International Orthopaedics
Journal of Veterinary Internal Medicine
Journal of Anesthesia
Journal of Cardiology
International Journal of Rheumatic Diseases
Cardiothoracic and Vascular Anesthesia
Journal of Advanced Nursing
Aquatic Botany
Journal of Infection
Journal of Dental Education
Health Economics Reivew
Schizophrenia Research
Environmental and Experimental Botany
Transfusion Medicine
Southeastern Surgical Congress
Pediatric Cardiology
Cardiovascular Therapeutics
Water Resources Research
Journal of Applied Entomology
Ophthalmology
Anesthesiology
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
Radiology

"The NCSS software is and has always been the best solution for my work as an assessor. I have been exposed to many other analytical and statistical software applications and have found there is no other product on the market that can match the ease of learning, comprehension of function, and the frugality of price the NCSS product offers..."

Michael Ireland, CAE, Assessor

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

Dr. Barbara Tabachnick, CSUN, Author