Total quarterback rating
Total quarterback rating (abbreviated as total QBR or simply QBR) is a proprietary statistic created by ESPN in 2011 to measure the performance of quarterbacks in American football. According to ESPN, "QBR incorporates all of a quarterback's contributions to winning, including how he impacts the game on passes, rushes, turnovers, and penalties. Since QBR is built from the play level, it accounts for a team's level of success or failure on every play to provide the proper context, then allocates credit to the quarterback and his teammates to produce a clearer measure of quarterback efficiency."
ESPN claims that it created QBR to be a more meaningful alternative to the traditional passer rating statistic. However, ESPN has never released the complete formulas and procedures to calculate QBR, resulting in criticism among fans and commentators alike questioning the results.