Hello Uwes,
Thanks. Re-reading the hclust pages I found that using the hclust
'USArrests' data that the command > plot (hc1) will generate the
order in which cases joined. however, I still can't see how to obtain
the respective height at which each case joined each cluster or the
height when clusters merge.
The dendrogram {stats} page provides the following code which
produces the information that I require. However, what I would like
to obtain is a table of the height at which cluster formed.
> hc <- hclust(dist(USArrests), "ave")
> (dend1 <- as.dendrogram(hc)) # "print()" method
> str(dend1) # "str()" method
I also found as.hclust which plots what I want, but I still can't
find a way to produce the actual height values which are being
plotted, for example as a tabular summary.
plot(hc) ; mtext("hclust", side=1)
Any assistance is appreciated,
Bob
At 04:01 AM 24/02/2013, Uwe Ligges wrote:
On 22.02.2013 11:41, Bob Green wrote:
Hello,
In SPSS the cluster analysis output includes an agglomerations schedule,
which details the stages when cases are joined.
Is it possible to obtain such output when performing cluster analysis in
R? If so, I'd appreciate advice regarding how to obtain this information.
If you are talking about hierarchical clustering via hclust(), see ?hclust
It tells you that the relevant information is available inside the
object and you can even see it via the plot method.
Uwe Ligges
Any assistance is appreciated,
Regards
Bob
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