from Amazon
Monday, February 06, 2012
Pitch Diversity Index
I love the idea, off the bat.
But, I don’t like the question. The peripherals already includes the diversity. A better thing to ask is if a pitcher with more diversity performs better than someone with less diversity, if you control for the fact they have the same fastball speed. (We will end up with a selection bias at the low-speed end, but not the high-speed. Well, we might, because we don’t have a measure for strike zone location, which, really, is what pitching is all about.)
Anyway, would love to see more work on this.