THIS WEEK
Into week four and the Bengals are lapping the field so far. They have been helped by 21st-ranked strength of schedule (SOS), but even taking down their team strength with that factored in is not enough to make them anything but dominant thus far.

Green Bay jumps up on their big victory over the Bears. That helped make Seattle’s SOS the second-toughest in the NFL after three games. The Chargers also won again, which is how Seattle actually increased their team strength this week without playing a game.

It is odd seeing the Packers so high. They are still allowing more points than they are scoring, but their passer rating differential is off the charts (+30.2) and they have played the fourth-toughest schedule so far.

San Francisco sneaks into the top ten as both their raw numbers and SOS improved with their win over Philly.



Just this week

I will provide the old rankings, without SOS, for comparison one more time.

Scatter

This view helps to give you a view of how teams are grouped together. You will generally see tiers of strength develop as the season wears on.

RANKINGS EXPLAINED
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:

(YPC (offense) + YPA (offense) + Avg Pts/Game Scored) – (YPC (defense) + YPA (defense)+ Avg Pts/Game Allowed)

The formula has proven to be a pretty accurate predictor of success, 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. 

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