I have need to compute a Mahanobis distance matrix between group centroids
of 28 different groups. (Because the analysis will need to be related to a
discriminant analysis of the identical data, and can be derived from same,
I need to derive the distances from the pooled within groups covariance
matrix). I'm not interested in the distances between individuals within a
group and the group centroid, or distances between individuals in one group
and the centroids of another group. All of this information is useful, but
not germane to the analysis (and display of results) I want to perform.
The mahalanobis function does not seem to do what I need. Can some one
point me to a routine that gives the necessary information or already does
this type of calculation. I can roll my own if necessary (I think), but
I'd rather not reinvent the wheel if there exists a well-tested routine
already out there to do the same thing.
Thanks.
Dr. Marc R. Feldesman
Professor and Chairman
Anthropology Department
Portland State University
P.O. Box 751
Portland, Oregon 97207
email: feldesmanm@pdx.edu
phone: 503-725-3081
fax: 503-725-3905
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