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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 11:29:35 -0700 (PDT)

That is exactly what happen. There was a cluster
analysis performed previously on these data by a
colleague and store that way. I am sorry for my
oversight. Everything is fine now.

Thank you,
Ricardo 

--- Steven Joel Hirsch Samuels
<sjhsamuels@earthlink.net> wrote:

> --
> 
> The name option names  group variable.  In Stata
> 9.2, only one group  
> variable is created at a time.  Did you run a
> previous cluster  
> analysis on the same data, possibly different
> variables, with three  
> groups and "name(cluster)"?   If so,  that would
> account for your  
> finding.
> 
> --Steve
> 
> Example:
> 
> . sysuse auto
> (1978 Automobile Data)
> 
> . cluster kmeans mpg weight displacement, k(3)
> name(cluster01)
> 
> . cluster list cluster01
> cluster01  (type: partition,  method: kmeans, 
> dissimilarity: L2)
>        vars: cluster01 (group variable)
>       other: k: 3
>              start: krandom
>              range: 0 .
>              cmd: cluster kmeans mpg weight
> displacement, k(3) name 
> (cluster01)
>              varlist: mpg weight displacement
> 
> 
> . tab cluster01
> 
>    cluster01 |      Freq.     Percent        Cum.
> ------------+-----------------------------------
>            1 |         15       20.27       20.27
>            2 |         39       52.70       72.97
>            3 |         20       27.03      100.00
> ------------+-----------------------------------
>        Total |         74      100.00
> 
> . ds
> make          mpg           headroom      weight    
>    turn           
> gear_ratio    cluster01
> price         rep78         trunk         length    
>    displacement   
> foreign
> 
> 
> 
> 
> 
> On Aug 8, 2007, at 12:56 PM, Ricardo Ovaldia wrote:
> 
> > 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.
> >>>
> >>> *
> >>> *   For searches and help try:
> >>> *
> >>>
> http://www.stata.com/support/faqs/res/findit.html
> >>> *   http://www.stata.com/support/statalist/faq
> >>> *   http://www.ats.ucla.edu/stat/stata/
> >>>
> >>
> >>
> >> Ricardo Ovaldia, MS
> >> Statistician
> >> Oklahoma City, OK
> >>
> >>
> >>
> >>
> >
>
______________________________________________________________________
> 
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> >> *   http://www.stata.com/support/statalist/faq
> >> *   http://www.ats.ucla.edu/stat/stata/
> >>
> >
> >
> > Ricardo Ovaldia, MS
> > Statistician
> > Oklahoma City, OK
> >
> >
> >        
> >
>
______________________________________________________________________
> 
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> > *
> > *   For searches and help try:
> > *  
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> 
> Steven Joel Hirsch Samuels
> 
> sjhsamuels@earthlink.net
> 18 Cantine's Island
> Saugerties, NY 12477
> Phone: 845-246-0774
> EFax: 208-498-7441
> 
> 
> 
> 
> *
> *   For searches and help try:
> *  
> http://www.stata.com/support/faqs/res/findit.html
> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/
> 


Ricardo Ovaldia, MS
Statistician 
Oklahoma City, OK


       
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