Message-ID: <83536658864BC243BE3C06D7E936ABD5027BAA70@xchg1.statistik.local>
Date: 2005-05-17T08:31:07Z
From: TEMPL Matthias
Subject: cluster results using fanny
> 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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