We use data back to 2000 with new parks only using data from when they were built or reconfigured.
We apply a weight to each factor based on the number of at bats at the park. The more at bats, the higher the weight, up to 1.00.
HR (% of hits that are HR)
3B (% of hits that are 3B)
2B (% of hits that are 2B)
Avg (% of at bats that are hits)
SO (% of plate appearances that are strikeouts)
BB (% of plate appearances that are walks)