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Tuesday, April 22, 2008
Fastball speed and movement, while resting
Ah, just what I’ve been thinking. In The Book, going through every single relief appearance in four years, I was unable to find any impact to a reliever being overworked (p. 231-234 I think). That’s not to say that the effect isn’t there. It’s just tough to find in “output” stats, since random variation causes alot of pollution. But, “input” stats, like fastball speed? Far less random variation to be sure. And Josh shows the effect exists on the third day of a 3-straight day effect. But, is it true? I don’t know. He doesn’t show if it’s the same pitchers in each bucket, and therefore, might simply be a selective sampling issue. You need to have a baseline to compare against. And, he also looks at movement (sinking action).
Good job…
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