Originally Posted by 2001MUgrad
I get tired of seeing the HR numbers by park. It has less to do with the Park as it does the team that plays there. The Reds have a team with a very powerful offense that hits lots of HR's period. The other thing is that they have a pitching staff, particularly starting staff that are notorious for giving up a ton of HR's. I don't think the Power numbers would be a lot different if the Reds called another park home unless it was say RFK or something just so out of the ordinary.
What park factor does is compare how many homers are hit (or runs scored, doubles, etc.) in GABP by the Reds and their opponents relative to the number of homers hit by the Reds and their opponents on the road.
So the park factor is the ratio of these things. So a 1.2 Home Run park factor means that the Reds AND their opponents hit 20% more homers at home than on the road. Essentially, this controls for the quality of the team playing in that park. That is to say, if the Reds lost Adam Dunn tomorrow, their park factor would not change.
Again, Park Factors are not counts of events -- they are ratios comparing the rate at which events happen at one stadium compared to other stadiums.