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SAS-like cluster statistics for ward's minimum variance method

Katell.Hamon at ifremer.fr 
Hi all,

I am looking for an easy way to compute statistics out of my cluster 
analysis using ward's method. Ideally it would be a table like that one 
http://www.tau.ac.il/cc/pages/docs/sas8/stat/chap23/sect2.htm#clug2
with various validation statistics for the last few number of clusters.
The diagnostic I'm the more interested in is the R-squared which 
represents the variance explained.

Is there a function doing this directly?
If not, Is there a way to convert the height into R^2 and an easy way 
to extract the height for each number of cluster?

Thanks in advance,

Katell