1. A method comprising: training a categorizer for plural categories using a machine-learning algorithm; classifying, by the categorizer, a set of cases into the plural categories; computing one or more quantification measures regarding cases in the set of cases based on output from the categorizer; providing information to enable ranking of the categories based on the one or more quantification measures; and effecting action to address an issue associated with at least one of the categories based on the provided information, wherein at least the classifying, computing, and providing are performed by software stored on one or more machine-readable media and executed by at least one processor.