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Originally Posted by RonCo
Just against adding a batter-by-batter/pitch-by-pitch performance modifier that has never been proven to exist...
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"The Book" by TangoTiger etc. shows strong statistical significance that pitchers become less effective with each batter:
http://www.amazon.com/gp/product/B00...lance&n=283155
And they find no evidence that its best to "jump on a pitcher early".
I've also seen studies that starters improve all their stats not just ERA when moved to the pen.
I think I've seen the first effect in Mogul but my sample size isn't that big yet. The second effect is definitely part of the game when you move a player to the pen or vice versa.