PASS 2023 Update

Use the button(s) below to download the PASS 2023 installation file. If PASS 2023 is not yet installed on your computer, this will install the full version. If you already have PASS 2023 installed, this will update your current installation to the newest version. Your personal files will not be affected.

PASS 2023 Download

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File: PASS2023Setup_v23_0_3.exe
Size: 299.6 MB
Current Version: 23.0.3
Released: February 1, 2024

Click here for minimum System Requirements

Update Release Notes

This page lists the changes that have been made to PASS 2023 since it was released.

Version: 23.0.3

Released: February 1, 2024

1. Corrected an error in the Dropout Report for several Multi-Arm Procedures. The total sample size was displayed incorrectly in some cases in the Dropout Report only. The correct sample size was displayed in the Numeric Report and plots. The Dropout Report was also removed from some Multi-Arm Survival and Multi-Arm Cluster-Randomized procedures where it was not supposed to be included.

2. Corrected a plotting error in the Mann-Whitney U or Wilcoxon Rank-Sum Tests (Noether) procedure. The software was incorrectly labeling a 2-sided test as a 1-sided test in the plot heading.

3. Corrected a “Subscript out of range” error in the One-Sample T-Tests using Effect Size, Paired T-Tests using Effect Size, Two-Sample T-Tests using Effect Size, Tests for One Proportion using Effect Size, and Tests for Two Proportions using Effect Size procedures. The error would occur when entering multiple values for Alpha with the Alternative Hypothesis set to One-Sided.

4. Corrected an error in the Tests for the Difference of Two Hazard Rates Assuming an Exponential Model procedure when solving for "h2 or D". The error occurred when the alternative hypothesis was one-sided (up or down). The procedure now correctly solves for "h2 or D" for all three alternative hypotheses.

5. Corrected an error in the Tests for the Ratio of Two Means in a Higher-Order Cross-Over Design (Log-Normal Data) procedure. The calculations were not correct when Mean Ratio (R1) was less than one.

Version: 23.0.2

Released: May 4, 2023

1. Corrected a non-useful error message in the Logrank Tests and Non-Inferiority Logrank Tests procedures. The user now gets an informative error message if they input Total Time < Accrual Time that indicates that Total Time must be ≥ Accrual Time.

2. Corrected an error in the Multi-Arm Non-Inferiority (and Superiority by a Margin) Tests for Vaccine Efficacy using the Ratio of Treatment and Control Proportions procedures. The procedure input window was missing the Test Type input option.

3. Corrected the comments regarding the test statistic weights in the help documentation for the Two-Group Survival Comparison Tests (Simulation), Group-Sequential Tests for Two Hazard Rates (Simulation), and Group-Sequential Logrank Tests (Simulation) (Legacy) procedures.

4. Corrected an error in the Tests for Two Ordered Categorical Variables (Proportional Odds) procedure. The software was interpreting the odds ratio (OR) as Odds1/Odds2 instead of Odds2/Odds1 as indicated in the documentation. The procedure now correctly interprets OR as Odds2/Odds1. Some minor typos and the example results in the documentation for this procedure have also been corrected.

5. Corrected an issue with the Simple Linear Regression procedures when solving for sample size. If the effect size is large resulting in a very small required sample size (i.e., 4 or less), the algorithm would not find the right sample size--it would report a required sample size of 2 even though the sample size is required to be 3 or more in the Simple Linear Regression procedures.

6. Corrected typographical and grammatical errors in 206 documentation chapters.

7. Corrected typographical and grammatical errors in hundreds of procedure option mouse-over messages.

Version: 23.0.1

Released: January 5, 2023

1. Initial Release of PASS 2023

NCSS is an excellent tool for clinical and epidemiological research that is both user friendly and economical with excellent support. It removes the "fear of statistics" from clinical research and makes research accessible to all curious clinicians.

Ted Rosenberg, MD MSc. FRCP(C), Clinical Assistant Professor, University of British Columbia

"I have used NCSS since it was NCSS 2000. Absolutely love it."

Dr. William Kennedy, Consultant