Quote:
Originally Posted by Stick50
So CABL (not rating) was the more telling rating?
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The overall defensive rating of a catcher is determined based on both the CABI (Catcher's Ability), and CARM (Catcher's Arm). The overall defense would be a better number to look at if you want the overall effect to ERA since it would take into account both pitch framing (and other abilities in the CABI) and the ability to shut down the running game (based on strength of catcher's arm). I was trying to isolate the effect of just the catcher's ability rather than arm on the overall ERA to see how important pitch framing is in the game. Determining the effect over overall defense on ERA would be a little more complicated due to the same defensive rating being determined based on two numbers rather than one. So for example, a specific overall rating could be because a catcher has a great arm and average CABI, or it could be because they have great CABI and average arm. There is a formula that was once posted that showed the interaction of the two ratings in coming up with the overall rating.
In addition to studying the change in CABI when CARM stays the same and its effect on ERA, it would be interesting to do the opposite and see how much the running game gets shutdown when the CABI stays the same and the CARM is changed. The simulations would be complicated based on what team they face as a team that doesn't steal much would be affected less by the change in CARM than run with a bunch of base stealers.