Dude, I just linked you to the ****ing ESPN site where it explains how QBR is calculated:
Quote:
* Season Leaders: On pace for 250 action plays.
* All-time data reflects 2006 onwards.
PASS EPA: Clutch-weighted expected points added on plays with pass attempts.
RUN EPA: Clutch-weighted expected points added through rushes.
SACK EPA: Clutch-weighted expected points added (lost) on sacks.
PEN EPA: Clutch-weighted expected points added on penalties.
TOTAL EPA: Total clutch-weighted expected points added.
ACT PLAYS: Plays on which the QB has a non-zero expected points contribution. Includes most plays that are not handoffs.
QB PAR: Number of points contributed by a quarterback over the season, accounting for QBR and how much he plays, above the level of a quarterback who plays very rarely and is on the fringe of the NFL.
QB PAA: Number of points contributed by a quarterback over the season, accounting for QBR and how much he plays, above the level of an average quarterback.
TOTAL QBR: Total Quarterback Rating, which values quarterback on all play types on a 0-to-100 scale.
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I'm just gonna shove the whole thing in.