The Pythagorean win percentage is calculated based on points versus opponents points. Game-to-game variation is all over the place but over the course of a season you might try to find a trend. It doesn't prove anything, and I wouldn't place a bet because of it, but the Patriots have gotten better as the season has gone on, and the Rams started out truly dominant, but are not quite as one-sided as the season has gone on. Of course, they are also playing better teams in the playoffs.
So both teams are pretty good, no doubt, but this simple form of analysis is consistent with the Las Vegas opinion that the Patriots might deserve to be a slight favorite.
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