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Defensive Efficiency = 1- (H-HR)/(AB-SO-HR+SH+SF)
Def Eff, or Defensive Efficiency, is the rate at which balls put into play are converted into outs by a team's defense. Def Eff can be approximated with (1 - BABIP), if all you have is BABIP, but a team's actual Def Eff is computed with
1 - ( H - HR ) / ( AB - SO - HR + SH + SF )
the Team Audit Standings use the latter formula.
Alternately, it will be seen some places (including some past editions of Baseball Prospectus) computed as 1 - ((H + ROE - HR) / (PA - BB - SO - HBP - HR)), which comes out slightly lower in most instances.
Here is an example of the Defensive Efficiency spectrum based on the 2011 season:
Excellent - Tampa Bay .735
Great - Texas .722
Average - Toronto .710
Poor - Pittsburgh .700
Horrendous - Minnesota .693
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