13. The computer-executed method of claim 12 , wherein determining the affinity score comprises normalizing the affinity score based on at least one from the group consisting of a cardinality of the union between the first population and the second population and a product of the cardinality between the first population and the second population.
12. The computer-executed method of claim 6 , wherein determining the affinity score comprises normalizing the affinity score based on a size of the first or second population.