property Aggregate.Base as String
Specifies the name of the Base Aggregate function to be used by current Aggregate object.

TypeDescription
String A String expression that defines the base aggregate function to be used by the current Aggregate object. Any of the following values are supported. In case an unknown base function is used, the Aggregate object shows as disabled in the control's context menu.
The Base property indicates the base aggregate function to be used by the current Aggregate object. If the Base property points to an unknown value, the Aggregate object shows as disabled in the control's context menu. 

The Base property could be one on the following: