A yet more up-to-date version appears at
http://members.iquest.net/~softrx/downothr.htm
Nick Cox
The program -rxridge- was written by R.L. Obenchain
and published in STB-28 in 1995. There is also
a more recent version by William Gould on the
StataCorp website, which contains a work-around
for problems arising with the program in Stata 6.
The author does not appear to be active in the Stata
community. There was some question a few years back about updating
this program further, but nothing happened as
far as I can see.
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