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Wednesday, January 13, 2010
Mail: Separating starters from relievers
> Anyone have a solid rule of thumb for determining who is a reliever vs
> starter? Games started >= X? IPouts >= X?
>
First off, I’d use GS/G. Secondly, I’d set it so that the total number of IPouts of my “starters” are 65% of all innings.
So, let’s see what happens if I look at 2009. Sum of IPouts is 129816. Starters get about 65% of that. So, 84380. Next, sort by GS/G, and sum until you get to 84380. 33.3%. Well, that’s a nice number.
Let me try 2008. These are your target numbers: 130073, 84547. And we get: 28.6%. Looks like we need a tie-breaker. Ok, 2007: 33.3%. 2006: 35.3%
I’ll stop there. The average of these 4 is 32.6%.
So, I’ll make that my rule of thumb: if at least one-third of your games is as a starter, you classify as a starter. Otherwise, you are a reliever. (This of course is based on the idea that you only want two buckets.)
***
This only applies to the recent seasons. If I go back one more year, I get almost 50%.
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