[R] rules for optimizing samples in CLARA (size and numbers) ?

From: vincent vicaire <vincent.vicaire_at_gmail.com>
Date: Thu, 03 Jun 2010 12:32:21 +0200


Hi,

With a 9000 observations dataset, I have noticed a significant variability in the silhouette index when I change the default value for samples (5 default value) and sampsize (40+2*clusters number) in CLARA.

Is there somes rules according to the number of cluster and observations to fix samples and sampsize parameters efficiently, so as to avoid under- and oversampling with CLARA in one hand and keeping a good time running in other hand ?

I didn't not find any rules of this type on the web (except avoiding biaised samples...).

Gratefully yours.
vincent

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