More info on PCA (principal components analysis) and related
techniques is available in various places around the web - jest
google.  Here are a few sites to get you started:
<br><br>

A simple tutorial on PCA is <a
href="http://csnet.otago.ac.nz/cosc453/student_tutorials/principal_components.pdf">here</a>.<br><br>

An introductory discussion of factor analysis (a slightly more general
framework than PCA) is <a
href="http://www2.chass.ncsu.edu/garson/pa765/factor.htm">here</a>.<br><br>

Some more advanced material, from a machine-learning point of view, is
<a
href="http://www.cs.toronto.edu/~roweis/csc2515/notes/lec9x.pdf">here</a>.
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