Re: [R] cluster.stats

From: Christian Hennig <chrish_at_stats.ucl.ac.uk>
Date: Fri, 13 Jun 2008 19:05:12 +0100 (BST)

Dear Laura,

> Dear list,
> I just tried to use the function cluster.stat in the package fpc.
> I just have a couple of questions about the syntax:
>
> cluster.stats(d,clustering,alt.clustering=NULL,
> silhouette=TRUE,G2=FALSE,G3=FALSE)
>
> 1) the distance object (d) is an object obtained by the function dist() on
> my own original matrix?

d is allowed to be an object of class dist or a dissimilarity matrix. The answer to your question depends on what your "original matrix" is. If it is something on which you can compute a distance by dist(), you're right, at least if dist() delivers the distance you are interested in.

> 2) clustering is the clusters vector as result of one of the many clustering
> methods?

The help page tells you what clustering can be. So it could be the clustering/partition vector of a clustering method or it could be something else. Note that cluster.stats doesn't depend on any particular clustering method. It computes the statistics regardless of where the clustering vector comes from.

Best regards,
Christian

>
> Thank you very much in advance and sorry for such basic question, but I did
> not manage to clarify my mind.
>
> Laura
>
> [[alternative HTML version deleted]]
>
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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Fri 13 Jun 2008 - 21:03:47 GMT

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