This page lists the changes that have been made to NCSS, PASS, and GESS since March 14, 2006.

April 18, 2008
NCSS 2007 (Version 1) updated to correct "subscript out of range" error in multiple regression with serial correlation when using categorical predictors.

March 27, 2008
NCSS 2007 (Version 1) updated to correct problem when importing dates from very large databases.

March 20, 2008
NCSS 2007 (Version 1) updated to correct overflow errors in Nonlinear Regression.

February 11, 2008
NCSS 2007 (Version 1) updated to fix importing and exporting issues for newer SPSS and Excel data file formats. NCSS 2007 (Version 1) now imports the most recent file versions of all major statistical analysis programs.

January 14, 2008
PASS 2008 Updated to fix the Chi-Square Effect Size Estimator. Some important boxes were hidden from view.

January 4, 2008
This release represents the final release of PASS 2008. The update adds the following new procedures to PASS 2008:

1. Mixed Models
2. Randomization Lists
3. Kappa Test for Agreement Between Two Raters
4. Confidence Intervals - Means (6 Procedures)
5. Confidence Intervals - Proportions (2 Procedures)
6. Confidence Intervals - Regression Slope
7. Confidence Intervals - SD/Variance (8 Procedures)
8. Confidence Intervals - Correlation
9. Cochran-Armitage Proportion Trend Tests
10. Normality Tests
11. Design of Experiments (9 Procedures)

User's who have already purchased a license to PASS 2008 should download and install the update to add the new procedures. There is no additional charge to add these new procedures if you already own a PASS 2008 license. Your current PASS 2008 serial number will automatically unlock these new procedures after you install the update.

December 7, 2007
PASS 2008 updated to fix a problem with the Multiple Comparison (Simulation) routines. The program was interpreting power (and beta) inputs incorrectly.

November 29, 2007
NCSS 2007 (Version 1) updated to fix a problem with the Two Correlated Proportions (McNemar) routine. The run button produced no output.

November 14, 2007
NCSS 2007 (Versions 0 and 1) updated to fix a problem in the X Bar chart routine. The rows skipped setting was not working properly.

November 6, 2007
NCSS 2007 (Version 1) updated to fix a problem that was occurring when running multiple two-sample t-tests with minimum and maximum x-axis values specified for the probability plot.

November 5, 2007
NCSS 2007 (Version 0) updated to fix a problem that was occurring when running multiple two-sample t-tests with minimum and maximum x-axis values specified for the probability plot. This update also adds a new spreadsheet command to automatically resize all rows and columns to display the contents of each cell. The command is found in the Edit menu under 'Resize Rows and Columns'.

November 2, 2007
PASS 2008 updated to fix a few typographical errors in the menus.

October 24, 2007
Release of PASS 2008 and NCSS 2007/GESS 2006 (Version 1). These new versions separate NCSS/GESS and PASS into two programs that operate independently of one another. These new versions of NCSS and PASS allow the user to function in a limited user (XP) and standard user (Vista) environment without problems. The Settings, Data, Junk, Report, and Macros folders have been moved to your 'My Documents' folder into a subdirectory named 'NCSS'.

Both NCSS 2007 (Version 1) and PASS 2008 are fully compatible with Windows Vista.

PASS 2008 adds several new procedures and features to PASS, including new survival analysis tools, microarray gene expression comparison tools, an enhanced user interface, an improved PDF help system, and the ability to create macros, which add programmability and streamline repeated tasks.

PASS 2008 has been released before all procedures have been added so that users can immediately begin taking advantage of the new features offered by PASS 2008. Purchasers of PASS 2008 will receive many additional procedures as they become available during 2008 at no additional cost.

All templates from previous versions of PASS are fully compatible with PASS 2008.

The upgrade also includes an improved help system that consolidates the PDF documentation and the Help System.  Adobe® Reader® Version 7 or later is required to use the new PASS Help System. You can download the latest version of Adobe® Reader® by clicking on the link below. The new help system is fully compatible with Windows Vista.

August 22, 2007
Some window positions were not set correctly.

August 20, 2007
The macro import function was not working properly for delimited ASCII files.

August 14, 2007
Minor corrections made in both NCSS and PASS.

July 19, 2007
Incorrect starting values were computed for the Holladay model in the curve fitting routine. Inconsistencies were found in sample sizes for nonparametric tests (Wilcoxon & Mann-Whitney) in PASS. Syntax errors in user-written macros were causing the program to terminate. Mixed Models variance component estimates were incorrect in some models with large numbers of repeated measures.

July 6, 2007
An improvement has been made to the NCSS & GESS Help Systems making it easier to print individual chapters from the documentation. NCSS 2007 now has the capability of launching individual chapter PDF files.

June 25, 2007
The PASS Confidence Interval for One Proportion procedure was giving incorrect results for some sample sizes due to internal rounding error.

June 18, 2007
This release represents the final release of NCSS 2007. The update adds the following new procedures and features to NCSS 2007:

1. Mixed Models
2. Optimal Data Matching
3. Greedy Data Matching
4. Data Stratification
5. Improved NCSS Help System

GESS 2006 was also updated in this release to include a new help system.

User's who have already purchased a license to NCSS 2007 should download and install the update to add the new procedures and the new help system. There is no additional charge to add these new procedures if you already own an NCSS 2007 license. Your current NCSS 2007 serial number will automatically unlock these new procedures after you install the update.

The update also includes an improved help system that consolidates the PDF documentation and the Help System.  Adobe® Reader® Version 7 or later is required to use the new NCSS Help System and the new GESS Help System. You can download the latest version of Adobe® Reader® by clicking on the link below. The new help system is fully compatible with Windows Vista.

April 20, 2007
The Kaplan-Meier procedure was calculating survival times incorrectly in some cases when an Entry Time variable was used.

March 30, 2007
The Multiple Regression routine was incorrectly limited to 192 independent variables.

March 16, 2007
Help file compatibility issue with Windows Vista fixed. You can now download a Windows Vista update from Microsoft to allow you to view the help file.

February 22, 2007
Non-compatible spreadsheet operations (Find, Replace, Fill) were made compatible with Windows Vista. The SendKeys function is now compatible with Vista.

February 14, 2007
Icons modified for compatibility with Windows Vista. Subdirectories added to Settings directory.

December 14, 2006
NCSS 2007 updated to correct a problem in the database merge routine.

December 5, 2006
NCSS, GESS, and PASS updated to remove "trial" note that appeared on data window after entering a correct serial number.

November 21, 2006
NCSS 2007 Updated. 'Subscript out of range' error was occurring when running nondetects analysis.

November 1, 2006
PASS 2005 Updated. 'Overflow' error was occurring for large sample sizes in the Kruskal-Wallis simulation routines.

October 31, 2006
NCSS 2007 and NCSS 2004 updated. Problem with the Meta-Analysis of Hazard Ratios Forest Plot symbol size. Also, there was a problem with the If-Then Transformation window; transformations in boxes 19-21 were not being read. The If-Then transformation button on the Transformation window was also not working correctly.

October 11, 2006
Release of NCSS 2007! NCSS 2004 updated to fix minor issues.

October 4, 2006
NCSS Scatterplots: An extra regression line appeared when the grouping variable contained a missing value.

September 18, 2006
Corrected problems that occurred during import of large Affymetrix CEL files into GESS. A problem with outliers not appearing on box plots in certain situations was also corrected.

July 14, 2006
Corrected problems that occurred when Excel files with empty columns were imported.

June 14, 2006
Fisher's Exact test was not giving the correct p-value in all cases.

June 1, 2006
The exact probabilities for the Wilcoxon Signed-Rank test for paired data were incorrect in some cases when all values on one side were greater than all values on the other side.

The Comparables report was not running for the .s0z database.

May 19, 2006
NCSS: The bootstrapping confidence limits of the Curve Fitting routine were not working in some cases.

This release includes GESS: a new program for the statistical analysis of microarray data.

April 19, 2006
NCSS: The Mann-Whitney routine was not detecting all ties in some cases.

March 28, 2006
In some situations, the PASS simulation routines where completing their sample size search before the power requirements were met.

March 14, 2006
The Box Plots were miss-labeled in the One-way ANOVA in some cases. An option was added to allow the modification of the Reference Value Default in Multiple Regression, Logistic Regression, and Cox Regression.
A correction was made to the PASS Match/Case control procedure. It was not searching properly when Find=Odds Ratio was used. A few typos were corrected in the pdf files.

lihood ratio.

January 5, 2005
In some cases, the supplemental variable in the Correspondence Analysis module was misread. This has been corrected.