VSUMSQ(variable[,filter]) returns the sum of the squares of the values of a variable. An optional filter can be specified.
The formula for VSUMSQ is:
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.