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From Ted Dunning <>
Subject Re: Method "observe" in AbstractCluster
Date Sat, 05 Nov 2011 17:45:55 GMT
Observe means "add an observation" in the sense of a statistical sample
containing a number of observations.

The s0, s1 and s2 instance variables are, I think, the respective sums of
coordinate-wise powers of the observed data (except for s0 which would be
the same for all coordinates).  It is a known issue that accumulating the
moments in this fashion is numerically unstable.

2011/11/5 WangRamon <>

> Hi Mahout users  I'm evaluating the cluster feature and reading
> AbstractCluster class, can you tell me where can i find more
> documents/explaination about the "observe" methods in this class and the
> s0, s1, s2 parameters, thanks in advance.   Cheers  Ramon

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