PASS Software

PASS software is an easy-to-use research tool for determining the number of subjects that should be used in a study. As the leader in sample size technology, PASS performs power analysis and calculates sample sizes for over 150 statistical tests. With more sample size options than any other package, PASS is the best research planning tool on the market.

New in PASS¹²

PASS 12 adds over 15 new power and sample size procedures to PASS, including z tests (3), conditional power (6), repeated measures (2), non-inferiority logrank (2), equivalence logrank (2), Lin’s concordance coefficient (1), probit analysis (1), and competing risks (1). Click here to learn more about what’s new in PASS 12.

Documentation & Validation

PASS comes with complete help system documentation that contains tutorials, examples, annotated output, references, formulas, validation, and complete instructions on each procedure. All procedures are validated with published articles or books.