Three weeks into the season, and while the top-four teams remain relatively unchanged, the rest of the NFL is in flux. Perennial playoff teams like the Philadelphia Eagles and Seattle Seahawks look vulnerable, while the 49ers have burst into the top-11. PFF ELO is designed to resist overreaction and doesn’t account for mid-season quarterback changes, so these rankings could appear slow to change in the eyes of the average NFL fan.
Like any ELO system, it adjusts the ranking of a team after each game based on what happened in the game and the perceived strengths of the team and its opponent prior to the game.