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Re: New function

From: John Darrington
Subject: Re: New function
Date: Thu, 26 Mar 2009 16:34:52 +0900
User-agent: Mutt/1.5.13 (2006-08-11)

On Wed, Mar 25, 2009 at 12:50:54PM -0300, Michel Boaventura wrote:

     I'm starting to work with an algorith who uses a dataset and a
     function called singular value decomposition (SVD) to try to find
     groups on the dataset.
     So far I'm using the Ben's site to export the .sav files to text, and
     using Octave to make the SVD. Looking at the GSL doc, they had the SVD
     in a very efficient way, so I start to think about put this
     functionality on PSPP. But because PSPP uses SPSS syntax, I'm
     wondering how new functions like that
     could be implemented.

So far as I recall, FACTOR ANALYSIS is the Spss command that deals
with singular value decomposition.  SVD requires the covariance matrix
of a data set. Jason is currently working on covariance matrix
generation.  I'm not sure how complete it is, but it's probably at a
stage where it can be used for non-categorical variables.


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