You know, "Crimes prevented Over rePlacement." (Or maybe just "C-POR.") Like WAR, wins above replacement, but for cops.
The idea is to break crime down by beat/post and looking at it over time (a long time, like years). Wouldn't it be nice to know if there actually was less crime on your post while you were policing. Of course would give incentive to under report crime. Still, it would be nice to know. And it's not like we have anything better.