PASS 2026 Update
Use the button(s) below to download the PASS 2026 installation file. If PASS 2026 is not yet installed on your computer, this will install the full version. If you already have PASS 2026 installed, this will update your current installation to the newest version. Your personal files will not be affected.
Current Version: 26.0.4
Released: June 15, 2026
Click here for minimum System Requirements
Documentation
Update Release Notes
This page lists the changes that have been made to PASS 2026 since it was released.
Version: 26.0.4
Released: June 15, 2026
1. Corrected a typo in the documentation for the Mixed Models Tests for Two Means in a 3-Level Hierarchical Design (Level-2 Randomization) procedure. The formula for f2 was noted incorrectly as f2 = 1 + Mρ1 – Mρ2. The formula has been updated to the correct formula: f2 = 1 + (M – 1)ρ1 – Mρ2. This error did not affect software calculations, which were (and still are) based on the correct formula.
2. Corrected an error in the Logrank Tests with Proportional Hazards (Schoenfeld and Wu) procedure. When solving for sample size with Group Allocation set to “Enter percentage in Group 1, solve for N1 and N2” and if Percent in Group 1 was greater than 50, the calculation would not find a solution.
3. Corrected and clarified documentation and Option Info messages related to the dispersion parameter in five Negative Binomial procedures (Non-Inferiority Tests for the Ratio of Two Negative Binomial Rates, Superiority by a Margin Tests for the Ratio of Two Negative Binomial Rates, Equivalence Tests for the Ratio of Two Negative Binomial Rates, Non-Inferiority Tests for Vaccine Efficacy using the Ratio of Two Negative Binomial Rates, and Superiority by a Margin Tests for Vaccine Efficacy using the Ratio of Two Negative Binomial Rates) where Negative Binomial dispersion was mis-identified as ϕ instead of κ. The Negative Binomial dispersion parameter is now identified as κ. The change did not affect calculations, which were (and still are) correct.
Version: 26.0.3
Released: February 12, 2026
1. Corrected and clarified the mouse-over message for βᴍ in the Tests of Mediation Effect in Logistic Regression procedure.
2. Corrected a "Value Out of Range" error in the Historical Controls procedures that occurred when running with Windows language settings that use comma as the decimal separator. This error cause some procedures to be skipped during Operational Qualification (OQ).
Version: 26.0.2
Released: January 23, 2026
1. Minor display corrections related to the menus.
Version: 26.0.1
Released: January 12, 2026
1. Initial Release of PASS 2026.
