Ryan Parker has a lot of great ideas over at his blog Basketball Geek, and here's another terrific example: Referee Efficiency. No, he doesn't evaluate each and every call made by the zebras... He uses the adjusted +/- framework to evaluate the on-/off-court impact of each ref -- for instance, Derrick Stafford is associated with a league-leading increase in 7.8 points per 100 possessions he’s on the court. Unfortunately, there's no word yet on what Tim Donaghy's impact was...

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