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RE: st: Cluster analysis variables - bug?


From   Ricardo Ovaldia <ovaldia@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   RE: st: Cluster analysis variables - bug?
Date   Wed, 8 Aug 2007 11:31:09 -0700 (PDT)

Thank you Nick. It was an error on my part.

Ricardo.
 
--- n j cox <n.j.cox@durham.ac.uk> wrote:

> I am not clear why your messages appear twice [this
> one] or three times [previous one].
> 
> I can't see your data. It helps to discuss problems
> using
> datasets that everyone can play with. I don't really
> care two hoots about those auto data, but they do
> serve
> a very useful purpose.
> 
> I answered your previous email briefly because I was
> very busy
> with something else, but a scatter plot answered the
> question w.r.t. the 
> one example I tried with the auto data.
> 
> It was something like
> 
> . cluster kmeans mpg weight, k(2) name(c1)
> 
> Otherwise, bug claims are difficult to discuss
> without specifics
> of precisely what you think is wrong. Output you
> don't understand
> is not necessarily buggy.
> 
> I am not an expert on -cluster-, so you may need to
> wait for
> someone who is.
> 
> Nick
> n.j.cox@durham.ac.uk
> 
> Ricardo Ovaldia
> 
> Thank you Nick. But I am not sure that helps. Both
> variables are discrete taking the values 1, 2 and 3.
> (I specific 3 clusters). Every value of -C1- appears
> for every value of -cluster-. I am at lost.
> 
> 
>             |                c1
>     cluster |         1          2          3 |
> Total
>
-----------+---------------------------------+----------
>           1 |        71         90         17 |
> 178
>           2 |         4        200        596 |
> 800
>           3 |       123        164          5 |
> 292
>
-----------+---------------------------------+----------
>       Total |       198        454        618 |
> 1,270
> 
> 
>  > --- Nick Cox <n.j.cox@durham.ac.uk> wrote:
>  >
>  > > A scatter plot of the two variables may
>  > > throw light on this.
>  > >
>  > > Nick
>  > > n.j.cox@durham.ac.uk
>  > >
>  > > Ricardo Ovaldia
>  > >
>  > > > This may be a very simple question, but I
> can't
>  > > find
>  > > > the answer. Doing a cluster analysis I typed:
>  > > >
>  > > > . cluster kmeans  q4_*, k(3) name(c1)
>  > s(kr(67492))
>  > > >
>  > > > I get two new variables -c1- and -cluster-.
>  > These
>  > > are
>  > > > different. Could someone please tell me what
> is
>  > > the
>  > > > difference between these two variables? Which
>  > one
>  > > is
>  > > > the cluster indicator.
> 
> *
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> 


Ricardo Ovaldia, MS
Statistician 
Oklahoma City, OK


       
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