On Jan 19, 2006, at 11:17 AM, Richard Williams wrote:
-oglm- was inspired by SPSS's PLUM command and its results have
been verified by checking it against PLUM.
I think it's worth noting here that PLUM was originally a program
written by Peter McCullagh, whose 1980 paper (Regression Models for
Ordinal Data, JRSS, B 42, 109-142) laid out much of the foundation
for ordinal regression models. I have no idea how SPSS came by this,
or whether their implementation bears any resemblance to the original.
I wonder about this too. :) There was a previous thread about the
differences between Stata & SPSS in the naming of links. In
particular, what SPSS calls nloglog and cloglog are called cloglog
and loglog in Stata's glm and cloglog programs (and now oglm). Joe
Hilbe explained the differences between Stata & SPSS in this post: