These ratings seem like a crock if Indiana has that high of a ranking despite taking Minnesota to OT.
You think IU v Minny is a crock, look at all the ones on the left of the graphic.
That said, those aren't ratings or rankings. It's just a comparison of net success rates; the percentage of your successful offensive plays minus your percentage of unsuccessful defensive plays. That's it.
Successful Plays:
First Down: Gains at least 50% of the required yardage.
Second Down: Gains at least 70% of the required yardage.
Third & Fourth Down: Gains 100% of the required yardage (a first down or touchdown)
A
positive net success rate means your team moved the chains and stayed on schedule more consistently than your opponent. A
negative net success rate means your defense allowed the opponent to stay on schedule more often than your offense did
All it's saying is how well you played vs how well your opponent played, down to down.