VGEOMEAN(variable[,filter]) returns the geometric mean of a variable.
The geometric mean is calculated as follows:
The geometric mean is undefined for a data set that contains zero or negative values.
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.