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Re: Re: st: St: cluster graphing


From   "Anders Alexandersson" <aalex@its.msstate.edu>
To   <statalist@hsphsun2.harvard.edu>
Subject   Re: Re: st: St: cluster graphing
Date   Fri, 25 Jun 2004 13:05:02 -0500

Justin <jdubas@nd.edu> asked,

> I did a nonheirarchical cluster analysis, using 3 variables and
obtaining 9
> clusters.  I am trying to graph this so I can visually show how these
clusters
> were classified, but the cluster tree only works for heirarchical.
> 
> Does anyone have any suggestions?

and Ken Higbee from StataCorp provided several good suggestions. I just
want to add a few
comments.

The Stata manual for cluster analysis points out that in the
introduction on page 5 that
"there exist infinitely more ways to perform a cluster analysis than
people who perform them".

Justin, do you have any theoretical idea of how the the variables are
distributed, e.g., elliptically?
Does a scatterplot with the third variable overlaid also suggest 9
clusters?

Anders Alexandersson
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