The following is a message I received from Jay Magidson regarding the history of
CHAID.


>From: "Jay Magidson" <jay@...>
>To: <tslim@...>
>Cc: "Babinec, Tony" <tbabinec@...>
>Subject: chaid
>Date: Wed, 22 Nov 2000 11:25:52 -0500
>
>Date: Nov. 22
>To: T.S. Lim
>From: Jay Magidson
>
>Gordon Kass developed CHAID as part of his dissertation at U of
>Witwatersrand, South Africa. He published in the journal Applied Statistics
>and offered to send his PL1 code to anyone upon request. Bill Perreault at
>U of North Carolina requested a copy and had a graduate student add some
>user friendly features and distributed that PL1 version for a few years.
>
>I, through my company Statistical Innovations (SI), developed a Fortran
>CHAID program and called it SI-CHAID. Originally, it was licensed on PCs in
>DOS, and later WINDOWS 3.1. I added several features, including a new
>algorithm for ordinal dependent variables (Kass' original CHAID algorithm is
>designed only for nominal dependent vars). I have authored several
>publications on CHAID. I sold the WINDOWS version to SPSS and they
>incorporated it into ANSWER TREE. I also developed 2 SAS PROCs called
>SI-CHAID and SI-DRAW (for IBM mainframes running under MVS -- now called
>OS3 -- which are marketed through SI. Gordon Kass is a licensee of my
>SI-CHAID SAS PROC.
>
>I hope this is helpful. Feel free to request any additional info, and
>please send me a copy of any info that you publish on CHAID.
>
>Thank you




--
T.S. Lim
tslim@...
www.Recursive-Partitioning.com



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