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Food for thought

At Sabernomics, JC has a great post examining the variation in home run hitting over time. It comes complete with data in the form of charts, and offers an alternative to the steroid theory. One implication of JC's theory, I think, is that the age of relief pitchers should have increased during the 1990s, relative to the age of an average player. That too, is testable, and perhaps a bit easier to execute than other auxiliary implications.