# Re: [R] cluster results using fanny

From: Uwe Ligges <ligges_at_statistik.uni-dortmund.de>
Date: Sat 14 May 2005 - 22:59:54 EST

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.
>
> I also find estrange the fact that if I set K=3 (three clusters), it
> gives membership for all three clusters (0.333 for all of them) and
> then when it gives the closest hard clustering they only belong to
> cluster 1 or 2, but none of them to cluster three. The plot shows only
> two clusters (also the silhouette plot, even if it gives in the
> "silhouette plot information" the silhouette width for the three
> clusters????????.
>
> Then, for the same data I set k=4 and surprisingly, it gives
> membership for the four of them (this time they are not all the same)
> and when it gives the closest hard clustering they only belong to
> cluster 1, 2, or 3 but none of them to cluster 4. The plot shows only
> three clusters (also the silhouette plot, even if it gives in the
> "silhouette plot information" the silhouette width for the four
> clusters????????. why didn't it give this three clusters when I set
> k=3??????
>
> For k=5 it gives all the information and then it only plots 2 clusters.
>
> This is very confusing. Also, if there is equal membership for all the
> clusters, how is it that I have a "closest hard clustering"? and a
> "neighbor"?

Can you speicfy a reproducible examples, please? Without an example, it is really hard to explain what happens...

Uwe Ligges

>
> Barbara
>
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