Defense-Independent ERA
In baseball statistics,
Defense-Independent ERA (dERA), created by Voros McCracken, projects what a pitcher's earned run average (ERA) would have been, if not for the effects of defense and luck on the actual games in which he pitched.
Method
Version 2.0 of dERA uses the following statistics:
Batters Faced (BFP)
Home Runs Allowed (HR)
Total Walks Allowed (BB)
Intentional Walks Allowed (IBB)
Strikeouts (K)
Hit Batsmen (HB)
0) Multiply BFP by 0.0074 to get the number of intentional walks allowed (dIBB).
1) Divide HB by BFP-IBB. Call this $HB. Then multiply $HB by BFP-dIBB. This number gives the DIPS number of Hit Batsmen (dHB).
2) Divide (BB-IBB) by (BFP-IBB-HB), and call this number $BB. Multiply BFP by 0.0074, and call this dIBB.
3) Divide K by (BFP-HB-BB) and call this number $K. Remember this number for later.
4) Divide HR by (BFP-HB-BB-K) and call this number $HR. Remember this number for later.
5) Calculate the number of 'Balls Hit in the Field of Play'. This is BFP-dHR-dBB-dK-dHB.