Since I posted "Road Kill" documenting the Astros' road woes, I've been playing around with the yearly home-road splits to see what else I can beat from that dead horse.
I ran all seasons for all teams to see whether the home or road records correlate to overall success. First, I compared the difference between a team's home and road record to its overall record. Do teams that perform best at home perform best overall? Or the road?
The results were that it just doesn't matter. There's no correlation whatsoever (coffecient of -0.006).
Home and road records correlate about equally well to the overall record (0.898 and 0.897 respectively), which is pretty much intuitive. OK, but how well does a team's home record correlate to its road record? Fairly well, but not great (0.611).
Since that didn't yield that much, let's next look at playoff teams. Do they behave differently than teams overall?
Overall playoff teams had a home winning percentage of .645, a road winning percentage of .570, a home-road difference of .075, and an overall percentage of .605. Again, overall percentage and home-road difference are unrelated (-.013). Home and road records for playoff teams correlate less well to their overall percentage (.726 and .734).
The one big surprise is that home and road winning percentages have almost nothing to do with each (coefficient of .078). Ok, maybe that's not the biggest surprise.
Anyway, here are the most extreme splits among playoff teams. First, biggest home-to-road difference: