Passer Rating vs QBR, Week 1

I’ve been looking at the NFL age-old Passer Rating stat and ESPN’s quarterbacking stat called QBR, which was instituted a decade ago to address alleged shortcomings in the Passer Rating.

I can sympathize with the desire for something like QBR. Passer rating can shortchange some quarterbacks. For instance, in the 1990s Brett Favre was throwing one-yard touchdown passes while Troy Aikman was handing off to Emmett Smith for one-yard touchdown runs. Favre’s TD% may have been inflated, while Aikman may have thrown for more TDs if his team’s running game hadn’t been so strong. QBR…