PASS 2023 Update

Update Release Notes

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

Version: 23.0.7

Released: January 21, 2026

1. Corrected an error in the Non-Inferiority, Superiority by a Margin, and Non-Zero Null Tests for the Difference Between Two Proportions procedures. When Power Calculation Method was set to Binomial Enumeration and Input Type was set to Mixture, the power and sample size for the Farrington & Manning and Miettinen & Nurminen Likelihood Score Tests were calculated incorrectly.

2. Corrected a minor typo in the documentation for the Tests for Two Means Assuming Equal Variances using a Bayesian Approach procedure. On page 123-2, the formula for θ = … was replaced with θ² = … . Also, clarification regarding α in the formulas was added.

3. Corrected a minor typo in the documentation for the Confidence Intervals for Kappa procedure. The confidence interval formula incorrectly referenced SD instead of SE.

4. This is the final update to PASS 2023.

Version: 23.0.6

Released: March 10, 2025

1. Corrected an error in the Tests for Two Groups using the Win-Ratio Composite Endpoint procedure. When solving for sample size with Group Allocation set to "Enter N1, solve for N2", the resulting group sample size (N2) was too large. This has been corrected.

Version: 23.0.5

Released: January 20, 2025

1. Corrected a visual error on 4 mediation procedure input windows. When solving for βᴍ (Reg Coef of M), the corresponding input box for βᴍ was not being hidden from view properly. This error did not affect the actual calculations.

Version: 23.0.4

Released: November 13, 2024

1. Corrected an error in the Confidence Intervals for One-Sample Sensitivity and Specificity procedure when solving for Sample Size. The error occurred when the Specificity is the parameter that drives the sample size, in the reporting of the Specificity column for C.I. Width. The procedure now gives the correct Confidence Interval Width for Specificity.

2. Corrected an error in the Logrank Tests procedure. When using the Mortality input type and using a spreadsheet column for M1, the mortality ratio (MR) values were not computed correctly.

3. Corrected significant power and sample size calculation errors in the following 6 procedures:
1. Non-Inferiority Tests for the Difference Between Two Poisson Rates in a Cluster-Randomized Design,
2. Superiority by a Margin Tests for the Difference Between Two Poisson Rates in a Cluster-Randomized Design,
3. Non-Inferiority Tests for the Ratio of Two Poisson Rates in a Cluster-Randomized Design,
4. Superiority by a Margin Tests for the Ratio of Two Poisson Rates in a Cluster-Randomized Design,
5. Non-Inferiority Tests for Vaccine Efficacy using the Ratio of Two Poisson Rates in a Cluster-Randomized Design,
6. Superiority by a Margin Tests for Vaccine Efficacy using the Ratio of Two Poisson Rates in a Cluster-Randomized Design.

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