Add assumeZeroMean VarianceAlgo #291
Merged
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This algorithm can be useful when trying to calculate to calculate the
varianceof an alreadycentered slice. Alternately, it can be useful in the context of linear regression where the residuals are assumed to have zero mean. More generally, it can be thought of as just the mean of the squares of the input. It can also be used to obtain the sum of the squares.