in reply to [OT] Grouping/clustering of values

You could google for k-mean clustering.

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Re^2: [OT] Grouping/clustering of values
by Anonymous Monk on Apr 09, 2005 at 19:38 UTC
    Yup, sounds like you want k-means with k=2 or (possibly) fuzzy c-means clustering with c=2 or c=3.
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