September 06, 2008
Regression to the Mean Rears its Ugly Head
Dan Haren pitched another poor game Friday night:
| Date | ERA |
| Through 2007 | 3.82 |
| April-July, 2008 | 2.62 |
| Aug-Sept, 2008 | 6.17 |
| Overall, 2008 | 3.53 |
Haren is still pitching well for the year, it's just that his regression is going in the wrong direction at the wrong time. Compare that to Johan Santana who regressed positively toward his mean in the second half. He'll come off as a hero while Haren might end up the goat.
Posted by David Pinto at
10:16 AM
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Pitchers
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