I included this as a link in a recent post on whether park sizes matter, but felt it deserved it's own post. I pulled something like 500 - 600 seasons worth of data utilizing a python script I wrote and calculated some updated park factors for how different parks actually perform in game.
The results can be found here. These aren't window dressing numbers like the ones listed by WiS in the select city screen. The fact still remains that cities like Burlington and Tacoma (-4 across the board) play essentially the same as parks like Seattle, and Colorado produces 11 percent more offense than a place like Santa Fe, despite comparable + ratings.
During the process of trying to create a park factors, I remembered how inconsistent WiS is in their stats and what they show. Runs are shown on the home/away splits for batting, but only unearned runs are shown for home/away splits for pitching. It makes no sense. Anyway, I estimated home/away wOBA utilizing the
formula from this website. It is definitely not perfect, but it's close to the factors I generated in the past that can be
found at this post.