[R] Is it possible to obtain an agglomeration schedule with R cluster analyis

[Bob Green]

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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