As we head toward the midpoint of the NFL season, the top six QBs in our power rankings have separated themselves from the pack.
Our rating is a composite of three advanced stats: defense-adjusted yards above replacement (DYAR), total QB rating (QBR), and win probability added (WPA). Each stat accounts for one-third of the rating.
Andy Dalton made a huge leap this week, and Philip Rivers reclaimed the coveted No. 2 spot.
UNRANKED: Kellen Clemens, St. Louis Rams*

Team record: 3-4
Thing to know: This could have been Brett Favre so be thankful.
*Not enough data to create a ranking.
UNRANKED: Jason Campbell, Cleveland Browns*

Team record: 3-4
Thing to know: The Browns have given up on Brandon Weeden.
*Not enough data to create a ranking.
UNRANKED: Josh McCown, Chicago Bears*

Team record: 4-3
Thing to know: He was 1-1 in two starts for the Bears in 2011.
*Not enough data to create a ranking.
See the rest of the story at Business Insider