1. A method of invalidating set-top box events, comprising the steps of: monitoring set-top box events; storing such events in an array; calculating trends in such events; invalidating set-top box events which deviate in a statistically significant manner from observed set-top box event trends, or which match previously defined invalid set-top box events; placing such invalidated set-top box events in an array; and calculating trends in such invalidated set-top box events such that some long-term trends may be revalidated, and to identify new set-top box event categories to be ignored.