We've become frequent users of a new stat, Total Quarterback Rating (Total QBR).
This stat attempts to measure everything a quarterback does-- passing, running, sacks, fumbles, and penalties.
Here's a quick primer on the fundamentals of Total Quarterback Rating:
Scoring: QBR is scaled from 0 to 100, from low to high. An average quarterback would be at 50. The NFL leader among qualifiers in 2012 was Peyton Manning (84.1). Mark Sanchez ranked last in the NFL (23.4)
For individual games, an average of about three quarterbacks per week finish with a single-game Total QBR of 90 or better, with one or two of those reaching 95. Those were the elite performances in 2012.
Expected points: All quarterback plays are evaluated based on how much they contribute to increasing or decreasing the team's chances to score. By determining expected point added values for all plays, Total QBR is able to assign points to a quarterback based on every type of play he would be involved in.
Dividing Credit: Total QBR factors in such things as overthrows, underthrows, yards after the catch and more to accurately determine how much a QB contributes to each play. This is based on video review of every play in every game.
Clutch Index: How critical a certain play is based on when it happens in a game is factored into the Total QBR score. A quarterback is rewarded more for making positive plays at significant moments in a game, as determined by the pre-play win probability.
For QBR leaders and season stats, click here.
For a more thorough description of the stat, click here