RDF v13.4 causal higher level parameter

Hi All,

When we set the 'causal higher level intersection' parameter to subclass/store for example and set the variable type to 'override from higher level' in promo maintenance workbook, how does the system compute the effects.

I would  like to understand, if the system computes the lift at subclass level as a  whole or computes the lifts of only the promoted items/stores within the subclass and then takes a mean (as mentioned in the guide) of all the lifts to apply to those items/stores for which no meaningful lift can be computed.

Or does the system calculates the lift at subclass level as a whole (considering all items, promoted vs non-promoted) and then applies the lift to those items/stores for which no meaningful lift can be computed.