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Re: st: Cluster analysis - cluster kmeans-


From   SR Millis <srmillis@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Cluster analysis - cluster kmeans-
Date   Sat, 12 May 2007 10:23:07 -0700 (PDT)

Joseph,

I've never encountered cluster analysis performed with
a single variable, so I'm interested in seeing how it
was done in the context of a paper/study making it
into the literature. Parlor tricks aside, just because
you can do something with a statistical procedure,
doesn't mean that it's advisable to do so.  Witness
stepwise variable selection techniques.

As an alternative to cluster analysis, in terms of
discerning categories from continua, the simplest of
the taxometric procedures, MAXSLOPE, requires 2
indicators of the target construct--but it won't work
with 1.

Regarding sample size, Meehl (1995) recommends a
minimum of 300 cases when doing taxometric analyses on
the basis of Monte Carlo research.

SR Millis

--- Joseph Coveney <jcoveney@bigplanet.com> wrote:

> SR Millis wrote:
> 
> Thanks, Ken. Can you cite a specific paper using
> cluster analysis with 1 variable with a sample size
> <30 that appeared in a peer-reviewed journal?
> 
> What's your point?
> 
> Joseph Coveney


Scott R Millis, PhD, MEd, ABPP (CN,CL,RP)
Professor & Director of Research
Dept of Physical Medicine & Rehabilitation
Wayne State University School of Medicine
261 Mack Blvd
Detroit, MI 48201

/ `--'( 
< [] []////////|:::)
\_.--.( 

Email:  smillis@med.wayne.edu
Tel: 313-993-8085
Fax: 313-966-7682
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