[R] calculating distances using Gower's coefficient on mixed variables.
maechler at stat.math.ethz.ch
Tue Sep 27 09:10:05 CEST 2005
>>>>> "nikonia" == nikonia <nikonia at duckmail.nl>
>>>>> on Mon, 26 Sep 2005 12:15:55 +0200 writes:
nikonia> I want to compute the distances in a mixed variable
nikonia> matrix using the Gower coefficient. I understand it
nikonia> is possible to calculate distances in a matrix with
nikonia> mixed variables using the dudi.pco command. How
nikonia> would this work?
No need for esoteric functions. The recommended(*) package
'cluster' has daisy() for computing dissimilarities.
One of its major features has always been the ability to work with
mixed variables (continuous, nominal, ordinal, .. (a)symmetric binary,...)
implementing a slight generalization of Gower's proposal.
Even though the help for daisy starts its 'Details' section with
>> 'daisy' is fully described in chapter 1 of Kaufman and Rousseeuw (1990).
I think I should add some more details to the help page when I
Martin Maechler, ETH Zurich
(*) recommended packages are always available by library(<pkg>)
in a normal R installation.
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