4. The method of claim 1 , wherein the comparison of the current entity collections that match the past entity collections to the current entity collections of the group includes: comparing the quantity of the current entity collections that match the past entity collections to the quantity of the current entity collections of the group.
4. The method of claim 1 , wherein the comparison of the current entity collections that match the past entity collections to the current entity collections of the group includes: comparing the quantity of the current entity collections that match the past entity collections to the quantity of the current entity collections of the group. 5. The method of claim 4 , wherein the group includes all of the current entity collections, and wherein comparing the quantity of the current entity collections that match the past entity collections to the quantity of the current entity collections of the group includes: dividing the quantity of the current entity collections that match the past entity collections by the quantity of the current entity collections of the group.