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Re: st: working with similarity matrices


From   Alan Neustadtl <alan.neustadtl@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: working with similarity matrices
Date   Fri, 25 Feb 2005 08:44:20 -0500

You might have a better experience using a software package designed
especially for your situation.  Both Ucinet (www.analytictech.com) and
Pajek (http://vlado.fmf.uni-lj.si/pub/networks/pajek/) can do what you
are asking (and more).  Older versions of Ucinet are free, the latest
version can be used for a limited time for free, and Pajek is also
free.  Both are social network analysis applications.

If you decide to use Ucinet and need some help to get going, let me know.

Best,
Alan


On Thu, 24 Feb 2005 22:55:32 -0500, Clarence C. Gravlee
<cgravlee@fsu.edu> wrote:
> Statalisters,
> 
> I have a standard case-by-variable profile matrix like this
> 
>   A B C D E F
> 1
> 2
> 3
> 4
> 
> and want to compute a case-by-case similarity matrix like this
> 
>   1 2 3 4
> 1
> 2
> 3
> 4
> 
> In this instance, I want to use Jaccard's coefficient of similarity,
> though at other times I'll want to use another similarity measure.  I
> need to be able to save this similarity matrix so that I can work with
> it using multidimensional scaling, principal components analysis, etc.
> Is this sort of thing possible in Stata?
> 
> It appears that several people have asked related questions about
> working with similarity matrices in the last couple of years, and no one
> seems to have gotten very far.  See, for example
> 
> http://www.stata.com/statalist/archive/2004-07/msg00605.html
> http://www.stata.com/statalist/archive/2005-02/msg00040.html
> 
> Is part of the issue that Stata assumes users would want to work with
> similarities only as part of cluster analysis?
> 
> As is probably apparent from my question, I don't have any programming
> experience in Stata.  I'm willing to learn, but given my needs, I wonder
> if Stata is the best language to invest in learning, or whether I ought
> to look elsewhere (like R).  I'd welcome your suggestions.
> 
> Thanks for your sharing your time and expertise.
> 
> Lance Gravlee
> --
> Clarence C. Gravlee, Ph.D.
> Assistant Professor
> Department of Anthropology
> Florida State University
> Tallahassee, FL 32306-7772
> (850) 644-4754
> (850) 645-0032 FAX
> cgravlee@fsu.edu
> http://lance.qualquant.net/
> 
> Research Associate
> Center for Demography and Population Health
> 
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