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Monday, March 02, 2009
Nuts and bolts
John Beamer gives us the nuts and bolts of regression and correlation.
It’s an almost certainty that the reason John reports higher correlations when he drops his AB to below 100 is because he’s introducing a whole new group of talent: pitchers as batters. Not only are there alot of them at that level, but their talent level is so much lower than nonpitchers that we are introducing a higher variance of player talent when we do that. And, as John notes in his article, the larger the spread in the underlying population, the more this will add to the correlation (all other things equal).
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