XLSTAT is a powerful and reliable Microsoft Excel add-in that has been developed since 1993 to enhance the analytical capabilities of Excel. XLSTAT rely on Excel for data input and display the results, but the calculation is done using autonomous software elements. XLStat also a complete set of data-analysis and statistical work. the use of Excel as an interface makes XLSTAT software user-friendly and efficient. quality calculations similar to those offered by the leading scientific packages.