Something called the Simple SRS
"Two quick notes about the rankings.
1) These are not intended to be surprise. The methodology may be somewhat complicated, but all these ratings are intended to do is quantify public perception.
2) These are not “my” ratings. These are simply the implied ratings based on the Vegas (or, more specifically, the Golden Nugget) points spreads; nothing more, nothing less."
http://www.footballperspective.com/implied-srs-ratings-of-college-football-teams-in-2015/
"Two quick notes about the rankings.
1) These are not intended to be surprise. The methodology may be somewhat complicated, but all these ratings are intended to do is quantify public perception.
2) These are not “my” ratings. These are simply the implied ratings based on the Vegas (or, more specifically, the Golden Nugget) points spreads; nothing more, nothing less."
http://www.footballperspective.com/implied-srs-ratings-of-college-football-teams-in-2015/