NCSS 2020 Update

Use the button(s) below to download the NCSS 2020 installation file. If NCSS 2020 is not yet installed on your computer, this will install the full version. If you already have NCSS 2020 statistical analysis software installed, this will update your current installation to the newest version. Your personal files will not be affected.

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Current Version: 20.0.3
Released: August 28, 2020

Click here for minimum System Requirements


PDF documentation for NCSS 2020 is installed with the software and can be accessed through the Help System. The documentation is also available online by clicking here.

Update Release Notes

This page lists the changes that have been made to NCSS 2020 since it was released.

Version: 20.0.3

Released: August 28, 2020

1. Corrected the Multiple Comparison’s using the McNemar Test report in the Cochran’s Q procedure. In some cases the binomial exact prob level was lower than it should have been.

2. Corrected an issue with the Y-Axis title Two-Factor Chart procedures when only plotting one factor. An appropriate value is now substituted for {Y} when a two-factor chart is created with only one factor.

3. Corrected a rarely occurring error that affected scatterplots with line segments drawn. In some cases, the plot would generate an “overflow” error. This has been fixed.

4. Corrected the label on the selection popup when inserting columns. The message indicated that columns were to be deleted instead of inserted.

5. Corrected a “subscript out of range” error in the Hierarchical Clustering / Dendrograms and Clustered Heat Maps (Double Dendrograms) procedures that occurred in some cases when applying a filter.

Version: 20.0.2

Released: May 22, 2020

1. Corrected a rare issue that occurred with procedures that contain a checked list box input (e.g. Descriptive Statistics – Summary Tables) after changing the computer’s language setting. Changing the language setting would cause the program to crash after launching the procedure.

2. Corrected an error in the One-Sample, Paired, and Two-Sample T-Tests procedures. The output page title was not being printed when the bootstrap report was at the top of a new page. Calculations were not affected.

3. Corrected an error in the Michaelis-Menten Equation procedure that caused the Individual Function Plots not to appear in the output.

4. Corrected an issue when importing and exporting delimited files (.csv, .txt) with text enclosed in double quotes. The importer and exporter now correctly handles text within quotes.

5. Corrected an error when importing Fixed Width Text Files using the Import Wizard. In rare cases the data would not import correctly if the user clicked “Finish” before proceeding all the way through the wizard.

6. Corrected an issue in the Correlation Matrix procedure that caused the procedure to use Row-Wise missing value deletion when Pair-Wise was selected in some cases. Similar issues in the PCA and Factor Analysis procedures were also corrected.

7. Fixed a rare issue in the Binary Diagnostic Tests – Clustered Samples procedure. For the test of Sensitivity & Specificity, when the variance of the difference is negative or zero, the z-value and prob level were output as zero when they should have been blank.

8. Corrected an error in the Confounding/Alias Section of the Analysis of Two-Level Designs output. The Term No. was not listed correctly.

Version: 20.0.1

Released: February 10, 2020

1. Initial Release of NCSS 2020.

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Dr. Barbara Tabachnick, CSUN, Author

I have been using NCSS in my high school class room for 22 years. I find it very easy to use and my students use it to calculate their results for their lab reports, science fair projects, and now they are using it for AP Research projects. It can be used for everything from the basics to the most advanced statistics. NCSS is very affordable for any high school budget.

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