Re: finding the centre of a cluster


"Reef Fish" <large_nassua_grouper@xxxxxxxxx> wrote in message
news:1180906471.022903.89400@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
On Jun 3, 8:14 am, "Nick" <tulse04-ne...@xxxxxxxxxxx> wrote:
"Question" <breceivem...@xxxxxxxxx> wrote in message

news:1180778044.224598.126320@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Is there any mathematical way for finding centre of clusters in
clustering issue?

As per Phil Sherrod, see

http://www2.chass.ncsu.edu/garson/PA765/cluster.htm

and look up "Cluster centers".

"Cluster centers are the average value on all clustering variables of
each
cluster's members"

That's an arbitrary definition of the "center" of a cluster.

The "centroid method" is one way to find the "center" of a
cluster. There are other criteria just as arbitrary. Why
would anyone want to know the center of a cluster anyway?

I didn't ask the question. But it is a long time ago, but something to do
with variability within clusters as between clusters. To do that AFAIR one
would have to have some measure of variability, which is generally based on
distance from x bar.

I might add that it is nearly 30 years since I have been working with this
material.

Nick


.

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