XLSTAT is a commercial statistical

Statistics

Statistics is the study of the collection, organization, analysis, and interpretation of data. It deals with all aspects of this, including the planning of data collection in terms of the design of surveys and experiments....

 and multivariate analysis

Multivariate analysis

Multivariate analysis is based on the statistical principle of multivariate statistics, which involves observation and analysis of more than one statistical variable at a time...

 software. The software has been developed by Addinsoft and was introduced by Thierry Fahmy, the founder of Addinsoft, in 1993. It is a Microsoft Excel

Microsoft Excel

Microsoft Excel is a proprietary commercial spreadsheet application written and distributed by Microsoft for Microsoft Windows and Mac OS X. It features calculation, graphing tools, pivot tables, and a macro programming language called Visual Basic for Applications...

 add-in. It was designed to help users gain time by eliminating the complicated and risky data transfers between applications that had been a requisite for data analysis.
XLSTAT is a suite of statistical modules that run in Microsoft Excel

Microsoft Excel

Microsoft Excel is a proprietary commercial spreadsheet application written and distributed by Microsoft for Microsoft Windows and Mac OS X. It features calculation, graphing tools, pivot tables, and a macro programming language called Visual Basic for Applications...

.

The core product of XLSTAT has functions to prepare, describe, analyze, model data and to test a hypothesis.