Clustering with 'agnes'

Arnav Sheth wrote:

Hello,

I had a question regarding clustering using the agnes() function from the

'cluster' package.

I was wondering if anyone knew how I can identify cluster points after

running the agnes function. 

For example, I created a dataset with points randomly scattered around

(0,0), (0,1) and (1,0). After clustering, the dendrogram shows all the
clustered points and I get the ordering and height and the agglomerative
coefficient. But nowhere do I see the three actual points listed. Although
agnes clusters until there is one main cluster, it is clear that at three
clusters, each of the clusters consist of points around the three main
points. I was wondering if there was any way in which I can have R give me
the actual cluster points at three (or any number, for that matter) clusters,
ie (0,0), (0,1) and (1,0). A visual display of the clusters would be even
better.

I have tried using idenfity after converting the agnes object to an hclust

object, but that only gives me a listing of the points in each cluster.

I hope this question is clear. I am a little new with both clustering and

using R for clustering, so please ask me to clarify if anything is unclear.

Your help would be most appreciated!

See the example of ?agnes, where the points are labeled.
Most easily use agnes() on a data.frame with rownames.

Uwe Ligges

With regards,
Arnav



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