This article was originally posted on Tar Heel Mania, but I like the FEI system so much I’m going to post it here.
Many thanks to Tomahawk Nation for tipping me off to this.
As someone who majored in a hard science in college, I should probably be more knowledgeable about advanced football statistics. Alas, I have been pretty faithful to the box score up until now. But then I was tipped off to Brian Fremeau’s Efficiency Rankings for college football (FEI for short). It’s a very interesting formula, which you can read about in detail at Brian’s website and in Football Outsiders articles such as this one.
In essence, the rankings are based on the principle that a team’s efficiency in each offensive and defensive drive is a better reflection of a team’s quality than simple statistics accumulated over 60 minutes of play. Like some human and computer polls, the quality of opponents and how well a team plays against good teams. Unlike most human polls, the system rewards teams that play well against good competition whether they win or lose.
Fremeau’s Game Efficiency formula is fairly simple, involving margin of victory (MOV) and competitive possessions (CP, meaning the number of possessions in the game before garbage time, or the opposing team has fewer remaining possessions than is required for a comeback). The formula is as follows:
Game eff. = (MOV / 7) / (CP / 2)
Based on this rubric, one can get a pretty clear idea of how games stack up against one another. Let’s use three examples. First, Florida’s frighteningly efficient 63-5 victory over Kentucky:
Game eff = (58 / 7) / (16 / 2) = 8.2857 / 8 = 1.0357
Pretty scary, right? Conversely, here’s Auburn’s infamous 3-2 victory over Mississippi State:
GE = (1 / 7) / (31 / 2) = 0.143 / 15.5 = 0.0092
Granted it would have been the same if the score was 49-48, but still. Finally, here’s UNC’s 45-24 win over Boston College:
GE = (21 / 7) / (24 /2) = 3 / 12 = 0.2500
Fremeau then takes the game efficiency data and adjusts and expands his stats, factoring in strength of schedule as well as adjusted offensive and defensive efficiency based on opponents. Most or all of Fremeau’s statistical explanations can be found in his articles on Football Outsiders.
With this rubric in mind, Let’s look at his FEI top 25. Keep in mind, he factors out all games against FCS opponents.
Wait a minute…am I reading this right? Is North Carolina…NUMBER 3!?!?
It’s like that, except replace “Michael Bay” with “the collective heads of everyone outside the ACC”.
Even more interesting than UNC’s #3 ranking here is their #1 ranking in adjusted defensive efficiency. What this means is that the Tar Heels do a better job of disrupting the efficiency of opposing offenses better than any other defense in the nation. And this is in spite of an apparent allergy to blitzes and the frustrating 2-minute defense. That, my friends, is impressive.
Mind you, FEI is not my new favorite poll because it’s very UNC-friendly. (But it helps.) It’s my new favorite poll because it is a lot less arbitrary than the coaches or media polls, and is a statistic-based ranking that better reveals who the good and bad teams really are.
Once again, this post could not have been possible without Tomahawk Nation.