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THE BOOK--Playing The Percentages In Baseball

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Friday, December 21, 2007

Dan Fox’s Manny

By Tangotiger, 03:52 PM

No way:

I don’t believe there’s an issue with the sample being biased though (for example Manny is a large part of the data set above) since we’re comparing all performances at home with those on the road and if he stinks at Fenway he should probably stink on the road which would cancel each other out.

Maybe Dan hasn’t read my With or Without You (WOWY) in THT08 Annual.  But, there’s simply no reason to create a park factor for Manny that actually uses his own performance.  You’re not going to create a HR park factor for LHH at Yankee Stadium by using Babe Ruth, and then applying it to Babe Ruth.  You need to compare how Manny does compared to others in the same contexts.  You can’t compare Manny to half of Manny.

Normally, for park factors, a guy might be 5% of the sample, which is why we don’t care too much about removing the offending player.  But, in this case, he makes up 50% of the sample.  The shortcut we allowed in the 5% case can no longer apply here.  You may still get the same conclusion in this particular case, but that’s besides the overall point.

(10) Comments • 2007/12/22 • SabermetricsFielding
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December 21, 2007
Dan Fox’s Manny