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From Ted Dunning <>
Subject Re: [math] correlation analysis with NaNs
Date Thu, 13 Dec 2012 14:58:34 GMT
This is a nice way to allow various conventions.  Sometimes -1 might be the
right value.  Other times a more principled value like NaN might be

My proposal would be that for every algorithm that is able to handle
>> missing data, we provide an argument (to constructors) that specifies the
>> "double" value that represents a missing value.

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