mjoc / polymars

Polychotomous Regression based on MARS (Coded by Me in College)

PolyMARS

An Splus package that I wrote (in S and C) while studying for an M.S. at the University of Washington.

It was written under the supervision of Charles Kooperberg, now at The Fred Hutchison Cancer Research Center.

It is not as old as the dates on the github repository would suggest (I have forked someone else's repo version), but is was one of the first implementations Jerome Friedman's MARS procedure, to be found free in wild. It is not exactly MARS as it uses different basis functions for the splines and can do Polychotomous Regression (multiple Y values to, for example, create a classifier). It was submitted to the Statlib Splus open-source package repository, the CRAN of it's day.

I didn't have a home computer for a number of years after leaving college (it was back in the day) so I had essentially orphaned it; happily others have taken good care of it.

The package was ported to R by Guido Masarotto and was eventually combined into another R package (polspline) by Charles Kooperberg, so is still available although newer fancier implementations of MARS are now available in R packages.