Saturday, February 27, 2010
Reader mail of the week: Regression based on playing time
About means regression: could playing time be used as a proxy for ability, to a degree? Say, if players who have around 620 PA hit .280, a player who has 620 PA would be regressed to .280; a player who has 140 PA might be regressed to .225.
Yes, absolutely and without question. Back at the old Primer, there was actually a research piece along these lines.
PA is not something independent, and therefore, it should be used as a parameter to establish talent level. This is obviously in something like hockey, where only the really good forwards play 20 minutes a game or the really good defensemen play 25 minutes a game. It’s less obvious in baseball, but it’s still there.


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