[R] Clustering with clara

[Christian Hennig]

Dear Paco,

as far as I know, there is no such problem with clara, but I may be wrong. 
However, in order to help you (though I'm not sure whether I'll be able to 
do that), we'd need to understand precisely what you were doing in R and 
how your data looks like (code and data; you can show us a relevant bit 
of the data using the str command). Chances are that the problem is 
not in clara but some other thing that you do doesn't do what you expect
it to do.

Christian

On Thu, 14 Jan 2010, pacomet wrote:

> Hello everyone
>
> I am trying to use CLARA method for finding clusters in my spatial surface
> temperature data and noticed one problem. My data are in the form
> lat,lon,temperature. I extract lat,lon and cluster number for each point in
> the dataset. When I plotted a map of cluster numbers I found empty areas in
> the map. The point is that the number of points that were assigned a cluster
> number are less than the original temperature analyzed points.
>
> Why are there less points in the clustering results? is there any option in
> the CLARA method to retain every single point? is there another clustering
> method that preserves all the points?
>
> Thanks in advance
>
> Paco
>
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*** --- ***
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