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st: Re: oglm program now available at ssc
Date: Fri, 20 Jan 2006 04:33:06 -0600
From: Phil Schumm <[email protected]>
Subject: Re: st: oglm program now available at ssc
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.
Interestingly, though McCullagh typically gets credit for the ordinal
regression model, McKelvey and Zavoina originally described it five
years earlier in a 1975 article in J. Math. Sociology, which
McCullagh apparently did not know about. I don't recall, however,
that M and Z consider the idea of different links.
I have no idea how SPSS came by this,
or whether their implementation bears any resemblance to the original.
I once asked someone in tech support at SPSS about the basis of their
PLUM procedure, and s/he said that it was based closely on
McCullagh's 1980 paper. As has been noted elsewhere, though, SPSS may
have slipped regarding conventional naming of the complementary
log-log link as described in McCullagh.
Regards,
=-=-=-=-=-=-=-=-=-=-=-=-=
Mike Lacy
Fort Collins CO USA
(970) 491-6721 office
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