XLispStat
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] It includes a variety of statistical functions and methods, including routines for nonlinear curve fit.[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.[9] XLispStat was historically influential in the field of statistical visualization.[10] Its author, Luke Tierney, wrote a 1990 book on it.[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. In the 1990s it was in very widespread use in statistical education, but has since been mostly replaced by R. There is a paper explaining why UCLA's Department of Statistics abandoned it in 1998,[12] and their reasons for doing so likely hold true for many other of its former users. Source code to XLispStat is available under a permissive license (similar terms to BSD)[13] See alsoReferences
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