Hi,
I just looked through the variance class, and saw that it only supports sample vasriance (N-1) but not population variances (N). Any reason for this, and can it be added?
It would probably be better to add this to one of the aggregates or StatUtils or to add a new statistic altother. This is because a UnivariateStatistic can only report one value. The most commonly used (at least in statistical applications) value for Variance and Standard Deviation is the sample statistic, which is why that is what the statistics named "StandardDeviation" and "Variance" report. From a user's perspective, its not too hard to convert; but I agree that it would be convenient to add these. Probably best to make new statistics in the moment subpackage called "PopulationXxx". Patches welcome ;-)
Phil
Cheers,
Kim
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