[R] cluster in R

[Christian Hennig]

Dear Weiwei,

> 1. Is there a way of evaluate the effecitives (or seperation) of
> clustering (rather than by visualization)?

The function cluster.stats in package fpc computes several cluster 
validation statistics (among them the average silhouette width).
Function clusterboot in the same package (recent version) assesses cluster 
stability. There are several interfaces to clustering methods implemented 
in R which are documented on the help page of kmeansCBI (which gives you 
kind of an overview of available "general purpose" clustering methods in R 
though I may have missed some).
There are also several methods for the visualization of separation (I 
know that you didn't ask for that) for which the function plotcluster is 
an interface.

Best,
Christian


*** --- ***
Christian Hennig
University College London, Department of Statistical Science
Gower St., London WC1E 6BT, phone +44 207 679 1698
chrish at stats.ucl.ac.uk, www.homepages.ucl.ac.uk/~ucakche