VCOVAR function
Description
VCOVAR(variable1,variable2[,filter]) returns the covariance of 2 variables. An optional filter can be specified.
Note
This function calculates a statistic on a variable. Be careful when you use this function in cells of the columns that correspond to the variable, because this actually adds a value to the variable which can lead to unexpected and faulty results. You can exclude the cell to avoid this.