SigmaXY Command

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SigmaXY[List of x-Coordinates, List of y-Coordinates]
Calculates the sum of the products of the x- and y-coordinates.
SigmaXY[List of Points]
Calculates the sum of the products of the x- and y-coordinates.
Example: You can work out the covariance of a list of points using SigmaXY[list]/Length[list] - MeanX[list] * MeanY[list].
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