Lichtman study fails to find umpire bias

On “The Book” blog, Mitchel Lichtman (mgl) runs his own version of the Hamermesh study, and finds no race bias on the part of the umpires.

He does it without using regression, adjusting the umpires’ stats for pitcher characteristics using more straightforward techniques. Definitely worth reading the whole thing now, even though mgl promises there’s more to come.