Hi,
since you are new to R, you might not be aware of some nice feature at
the homepage of R: the task view
http://cran.r-project.org/web/views/
For various topics, somebody kindly provided an overview of packages and
functions for the specific topic.
Also for cluster analysis:
http://cran.r-
Using Mathematica, I've performed a hierarchical clustering
of 3,107 U. S. counties based on 1995-2000 intercounty
migration, using an algorithm of my own devising
(see http://arxiv.org/abs/0807.1550). I can also generate
the associated 3,107 x 3,107 matrix of ultrametric distances.
Unfortunately
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