So we'll be doubly screwed if the Brewers don't seize homefield advantage now because adjustments aren't being made home/road. I would personally weigh that very little. While we expect players in general to perform better at home, Greinke's 2011 home/road split is flukishly large. In contrast, he actually had a better ERA on the road last year. As is with many of the seemingly unexplainable splits baseball fans latch onto, the most likely explanation for it is going to be largely centered around luck. If someone wants to use it as a tiebreaker, great. The Brewers aren't competing in the playoffs next season or last. They're competing in the playoffs this season. And this season he's struggling on the road, while that's occurring to Marcum at home. You don't think they are aware of that which in turn effects their performance until there's a game or two which turns things around for him in that department. Athletes in sports (especially in baseball which requires preciseness of movement) are streaky overall and situationally and they'll acknowledge it comes down to confidence. You'd refer to that as "anecdotal evidence", a buzz-phrase to deligitimize the information, but you could also classify it qualitative research. And while quantitative research is more reliable on average because it's not as prone to bias (although it is from the interpreter), qualitative research has the potential to be more valid because more variables can be accounted for. For example, you're using standard deviation to pawn off extreme ups and downs as luck because they more or less average themselves out over extended periods of time. However, what is to say there aren't causes to the ups and downs though, especially when numerous ballplayers themselves would tell you that is the case. The events aren't anomalies if they are extreme and frequent. Rather, the opposite is the case. They are tendencies. Greinke and Marcum have established a tendency in the present which requires being adjusted to if possible.