Total QBR updates for 2013

Originally Published: September 5, 2013
By Dean Oliver | ESPN Stats and Information Group

Total QBR was introduced in 2011 to improve upon the NFL passer rating by accounting for more of what a quarterback does, including his rushes, scrambles, fumbles and sacks. It also accounts for when things happen -- 5 yards on third-and-4 being more meaningful than 5 yards on third-and-14, for instance.

As QBR enters its third NFL season of use, we have found a few additional things to improve it, as we did last year.

The biggest change is how clutch weighting is done. ...

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