The data analysis software - VSTAT - allows to provide the big number of calculations for big amount of data within a short time, which makes it a convenient tool for solving practical problems. VSTAT is the next generation of statistical software which has been developing for about 12 years. The program requires Windows 9x/2000 and MS Excel 97/2000. It is based on original mathematical library, and it exposes rich set of API functions. This is why VSTAT can be used either as stand alone application or as the library for the applications, which need to access data analysis functions. This program is intended for data analysis in the areas of the economics, medicine, sociology, physics, etc.