In this new series, I will highlight one of my least favorite SABR tropes, starting off an article by name-dropping Voros McCracken and explaining DIPS. First off, Matt Swartz in his recent, three-tabled article, “Adjusting defense efficiency by the quality of pitching“:
Fausto Carmona throws a hard sinker on the outside corner, but Ichiro Suzuki turns it into a well-struck ground ball by going the other way, splitting the defenders on the left side of the diamond. We know who should get credit for the single on the Mariners’ side of the box score—there was only one guy with a bat. But who on the Indians will take the blame for the single? Is it Carmona who made the pitch, or the defenders who could not get to the ball fast enough?
Bill James invented Defensive Efficiency, measuring the percentage of balls in play that a defense turns into outs. It became apparent just how useful this would be for evaluation of team defense when Voros McCracken famously concluded that, “There is little if any difference among major-league pitchers in their ability to prevent hits on balls hit in the field of play.” A natural corollary to this thesis says that to measure team defense, one should use Defensive Efficiency rate.