You should use implied probability instead of American odds for this, otherwise the scale is non linear wrt probability and your percent changes don’t really make any sense (a 50% drop in American odds doesn’t mean a 50% drop in the probability of a team winning a Super Bowl)
You should use implied probability instead of American odds for this, otherwise the scale is non linear wrt probability and your percent changes don’t really make any sense (a 50% drop in American odds doesn’t mean a 50% drop in the probability of a team winning a Super Bowl)