WeightedVariance
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Function Description
Returns  ,
the weighted (sample) variance of a series
,
the weighted (sample) variance of a series  given
weights
 given
weights  (for
 (for
 ),
calculated as follows:
),
calculated as follows:
 

 
See Weighted Moments
and Cumulants for further details and explanation of terms in this formula.
If the weights are equal then returns the same as MnVariance.
 
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