Evaluates the covariance the two (ordered) discrete variables.
xValues[k]).yValues[k].The covariance between the two (ordered) discrete variables.
For example, if the two
discrete variables take values (xValues[0], yValues[0]),
(xValues[1], yValues[1]),... , (xValues[n], yValues[n]),
then here we evaluate the covariance between the xValues and the yValues.
Correlation Class | WebCab.Libraries.Statistics.Correlation Namespace