You make some good points about schedule differences not being included in the ratings. Just too time consuming for me to add that right now. But I don't think it would have that much impact since teams play so many games and will always play some very strong teams and some very weak teams.
I have heard people mention that the Patriots played such a tough schedule in 2007. I did the math and their opponents had a combined record of 120-136. I realize 16 of those loses were against the Patriots so that comes out as 120 wins and 120 loses for their opponents. I realize the Patriots played some tough teams but they also played in an easy division and got 2 games against each division opponent so it all balanced out.
Thanks for the comments and let me know if you ever come up with some alternate ratings since it is interesting to see how they compare.
I have heard people mention that the Patriots played such a tough schedule in 2007. I did the math and their opponents had a combined record of 120-136. I realize 16 of those loses were against the Patriots so that comes out as 120 wins and 120 loses for their opponents. I realize the Patriots played some tough teams but they also played in an easy division and got 2 games against each division opponent so it all balanced out.
Thanks for the comments and let me know if you ever come up with some alternate ratings since it is interesting to see how they compare.