HFA trends are volatile at the individual season level, but long term trends show a steady decline. From 2000 to 2019, trailing 10 season HFA declined from 2.9 points to 2.2 points

Individual teams may experience periods of elevated HFA, but elevated HFA is not predictive of future elevated HFA across any window of games

Variation in HFA for individual games does not appear to be significantly influenced by the mileage traveled by the away team. Away travel correlates with divisional games, which exhibit a much stronger relationship with HFA

Modeled HFA is 2.95 non-divisional games and 1.59 for divisional games