NCSS 2023 Update

Update Release Notes

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

Version: 23.0.6

Released: July 11, 2025

1. Corrected an error in the following four One Proportion procedures: One Proportion, One Proportion – Non-Inferiority Tests, One Proportion – Superiority by a Margin Tests, One Proportion – Equivalence Tests. The error had occurred when "Type of Data Input" was set to "Tabulate "Successes" from a Categorical Outcome Variable in the Database", with multiple outcome variables, and with the case of one or more of the outcome variables having no successes. Prior to the fix, the results for a column with no successes would mirror those of the previous column, rather than having an X of 0. This was corrected so that all columns with no successes would have the appropriate X of 0.

2. Corrected an error in application-wide percentile calculations when using the "EDF w/ Ave" formula option. In some instances (i.e., when NP is an integer) the result was slightly off.

Version: 23.0.5

Released: January 28, 2025

1. Corrected an error in the Tolerance Intervals procedure. The Nonparametric Upper One-Sided Tolerance Bound was being calculated incorrectly. NCSS was reporting a value one spot less than the actual data value as the tolerance interval (e.g., if the 299th data value was the actual nonparametric tolerance bound, NCSS would report the 298th data value instead). NCSS was also reporting an upper tolerance bound in some cases when there was not sufficient data to compute it. Both errors have been corrected.

Version: 23.0.4

Released: January 20, 2025

1. Corrected an error in the Correlation Matrix procedure. The Pearson correlation p-value was being reported in place of the Spearman correlation p-value.

Version: 23.0.3

Released: February 2, 2024

1. Corrected an error in the Clustered Heat Maps (Double Dendrograms) procedure. The wrong clustering method was indicated on the Cluster Detail, Linkage, and Distance reports. The correct clustering method that was selected on the procedure input window was being used to generate the output, so the error did not affect actual calculations. Only the report label was incorrect.

Version: 22.0.2

Released: May 5, 2023

1. The System Options windows was too large for some laptop computers. The size of the System Options window has been reduced to match previous versions.

2. Corrected the comments regarding the test statistic weights in the help documentation for the Kaplan-Meier Curves (Logrank Tests) and Group-Sequential Analysis for Two Hazard Rates procedures. The Weighting of Hazard Comparisons Across Time column of the Logrank Tests Summary report in the Kaplan-Meier Curves (Logrank Tests) procedure was also updated. The update did not affect calculations—it only affected the general comments about the weights.

3. Corrected an “overflow” error that occurred in the Confidence Intervals report of the Appraisal Ratio Studies procedure when analyzing large datasets.

4. Corrected typographical and grammatical errors in 106 documentation chapters.

5. 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 NCSS 2023