Yes, at the UnivariateStatistic level, these would need to be new
classes. My question as well is "Does it apply as well to higher order
moments?"
Maybe we should place everything into the following packages:
o.a.c.m.stat.univariate.moment.sample
o.a.c.m.stat.univariate.moment.population
-Mark
Phil Steitz wrote:
Kim van der Linde wrote:
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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Mark Diggory
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Harvard MIT Data Center
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