Dear R help,


I am trying to cluster my data according to "group" in a data frame such as
the following:

df=data.frame(group=rep(c("a","b","c","d"),10),(replicate(100,rnorm(40))))


I'm not sure how to tell hclust() that I want to cluster according to the
group variable.  For example:

dfclust=hclust(dist(df),"ave")

plot(dfclust)

Clusters according to each individual row.  What I'm looking for is an
unrooted tree that will show similarity/dissimilarity among groups
according to the data set as a whole.

I appreciate the help,


MO

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