now, QBR accounts for opposing defenses: Quarterbacks who face tougher defenses will have their ratings adjusted upward in proportion to the difficulty of their opposition, and those who face weaker defenses will have their ratings adjusted downward. This is one more step toward gaining a true measure of overall quarterback performance -- and a big step.
Here's how the opponent adjustment works. Early in the season, we don't have enough information on how good each defense truly is. It usually takes several weeks of data to have a reasonable estimate of how tough each defense is. So the adjustment starts with an estimate for each defense, which is based on a model of how defensive performance varies from one season to the next. Then, as each week is played, we update that estimate with performance information from each game. The result is an accurate and relatively stable estimate of how tough each defense is for a quarterback to face. Several weeks into the season, the effect of the early estimate becomes very small, and by the end of the season it is virtually nonexistent.
https://www.espn.com/nfl/story/_/id/17653521/how-total-qbr-calculated-explain-our-improved-qb-rating
No reason to fret over this stuff. It'll even out as time goes on. Jimmy will get his due if the numbers say he deserves them (per this stat).
[ Edited by random49er on Nov 23, 2022 at 3:13 PM ]