Originally posted by Matthew C.
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Let's take a player like Matt Holliday.
From 2004 to 2008 Holliday hit in Coor's field. Coor's field is a very well-known 'hitter's paradise'.
Holliday 2004-2008 Home: .423/.625 (OBP/SLG), .450 wOBA, 156 wRC+, 1353 PA's, 84 HR, 307 RBI
Holliday 2004-2008 Away: .348/.455 (OBP/SLG), .348 wOBA, 108 wRC+, 1303 PA's, 44 HR, 176 RBI
Holliday 2004-2008 TOTAL: .386/.552 (OBP/SLG), .400 wOBA, 133 wRC+, 2698 PA's, 128 HR, 483 RBI
Totally different player at home and on the road, right?
Holliday moved out of Coor's in 2009. If he is solely a product of Coor's Field then we'd expect his numbers from 2009 through 2012 to look more like his 2004-2008 away numbers. Is that what we observe?
Holliday 2009-2012 TOTAL: .388/.517 (OBP/SLG), .390 wOBA, 146 wRC+, 2549 PA, 101 HR, 389 RBI.
Nope. Not what we observe at all. His overall numbers from 2004-2008 and 2009-2012 are quite similar (.390 wOBA compared to .400 wOBA. There has been a league-wide reduction in offense, especially power so the SLG% are different). Per wRC+ he's actually better over all after leaving Coor's field (146 to 133).
This is the point that I'm trying to make. I don't speak for everyone, or anyone, else. League & park adjusted numbers do a good job of taking the differences in stadiums into consideration. There's no need to say that so-and-so is a the hitter that he is on the road. The evidence, disproves that.
What does that mean for Yaz? His counting numbers HR's, R'sBI, etc may be inflated from playing in Fenway, but we can still accurately measure his true offensive output. His true output ISN'T just what he hit on the road.
*Stats from FanGraphs
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