[R] cluster results using fanny

[TEMPL Matthias]

> Barbara Diaz wrote:
> > Hi,
> > 
> > I am using fanny and I have estrange results. I am wondering if 
> > someone out there can help me understand why this happens.
> > 
> > First of all in most of my tries, it gives me a result in 
> which each 
> > object has equal membership in all clusters. I have read that that 
> > means "the clustering is entirely fuzzy". Looking at the 
> graphics it 
> > is really difficult to understand how objects with so 
> different scores 
> > for the variables have the same membership for all the clusters.

Hi Barbara,

I think, there is a problem with fanny, when you have standardised data.
For example:
library(mvoutlier)
library(cluster)
data(chorizon)
a <- fanny(chorizon[,101:110],4)
b <- fanny(scale(chorizon[,101:110]),4)
a$mem # is ok, but
b$mem # have same memberships

Better to use function cmeans in package e1071, which gives correct
memberships!

Best,
Matthias



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