Albretch Mueller wrote:
as part of
http://commons.apache.org/math/
you have:
http://commons.apache.org/math/apidocs/org/apache/commons/math/stat/descriptive/DescriptiveStatistics.html#addValue(double)
however I don't see something like:
addValue(new_val, NoV, Mean, Std_Dev, Skew)
in order to get the new statistics based on the old one?
It is very easy to do the Math to calculate the new Mean, Std_Dev and
Skew, based on the old values for a certain new value
Why doesn't http://commons.apache.org/math/stat/ give you that?
No reason, other than that no one has suggested this. Patches are
always welcome. I am not sure what the best API would be for this
enhancement, but it would probably belong in the StatUtils class.
Anyone else have ideas on how best to do this?
Phil
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