NFL Power Rankings Week 13: Seahawks Join Top Four
Not a ton of movement this week in the top ten, especially in the top five. Seattle and Minnesota swap spots after the Seahawks victory. New England continues to bleed team strength as their offense slides.
Seattle has faced the second or third toughest schedule in the NFL depending on which strength of schedule formula you use. Their only losses are to the top-ranked Ravens and 7th-ranked Saints. Seattle is now 2-1 against the top five teams. They are 5-2 against the top 15 teams.
San Francisco, on the other hand, is 0-2 against the top five teams and 3-2 against the top 15 teams.
One team to watch in the AFC is the Titans. Both the Titans and the Bills have been coming on strong.
This view shows tiers of strength that develop over the course of the season.
Power rankings are always debatable. I don’t buy into the gut feel methods most places use to determine their rankings, so I developed a formula a few years back that attempts to take at least some of the subjectivity out of the discussion. My approach was simple, I measured offensive and defensive efficiency based on the Yards Per Carry (YPC) and Yards Per Attempt (YPA), as well as points scored and points allowed. The formula to calculate “Team Strength” was as follows:
The formula has proven to be a pretty accurate predictor of success (roughly 70% of the teams ranked in the Top 10 by week 3 make the playoffs), but I am always looking for ways to improve it. I read a great article on ColdHardFootballFacts.com. There was one gem in there about predicting championship teams. The article mentioned passer rating differential as the “mother of all stats.” A full 69 of 72 champions have ranked in the Top 10 in this statistic. It is a stat after my own heart, as I believe offensive and defensive efficiency is the key measurable outside of point differential. Turnovers would factor in there as well, but I am not convinced a team has as much control over that. My power rankings use YPA and YPC differentials. I went ahead and replaced the YPA with offensive and defensive passer rating, to give me this:
(YPC (offense) + Passer Rating (offense) + Avg Pts/Game Scored) – (OPP YPC (defense) + OPP Passer Rating (defense)+ OPP Avg Pts/Game)
As of September 23, 2014, I have added a strength of schedule component to the rankings as well.
As of November 22, 2016, I have increased the weighting of the run game and point differential. Yards per carry will be multiplied by 10 to make it more evenly weighted with the passer rating. It is still roughly half as important, but will have a greater impact. Point differential will be multiplied by two as it still should be among the most important aspects of measuring teams.