Sunday, January 22, 2006

IMPORTANT: Minor League ERAs

The minor league ERAs for 2005 in the Guide are wrong. Somehow I screwed it up and missed it during the proofing. The number in the ERA column (in minor league lines only) is actually the pitcher's RAA, which includes unearned runs as well as earned runs. This isn't an unuseful number, there is research that suggests the RAA is a better measure of a pitcher's talent than his ERA, but that isn't an excuse or justification. I somehow pointed Excel at the wrong column and didn't discover the mistake during proofing.

I'm sorry for the screw up.

Here is a web page that shows all the players in the Guide, their RAA and their corrected ERA. As a rule of thumb, subtract .6 from a pitcher's RAA to get his ERA, though this can be a wildly wrong for individual players.

I'm really sorry for the screw up.

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