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
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