XLispStat is a statistical scientific package based on the XLISP language.
Many free statistical software like ARC (nonlinear curve fitting problems) and ViSta are based on this package.
[citation needed] Many add-on packages have been developed to extend XLispStat, including contingency tables[3] and regression analysis[4] XLispStat has seen usage in many fields, including astronomy,[5] GIS,[6] speech acoustics,[7] econometrics,[8] and epidemiology.
[11] XLispStat dates to the late 1980s/early 1990s and probably saw its greatest popularity in the early-to-mid 1990s with greatly declining usage since.
Source code to XLispStat is available under a permissive license (similar terms to BSD)[13]