The truth about QBR

LocimusPrime

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it’s complete trash

Further controversy erupted when the Total QBR system gave the Denver Broncos' Tim Tebow a higher rating than the Green Bay Packers' Aaron Rodgers in their respective Week 5 contests in 2011. Noting that Rodgers completed 26 of 39 passes for 396 yards and two touchdowns in a win over the Atlanta Falcons, while Tebow completed four of 10 passes for 79 yards and a touchdown, and six rushes for 38 yards and a touchdown, in a loss to the San Diego Chargers. In a more recent example, a game played on September 24, 2017, Alex Smith of Kansas City Chiefs received an inexplicable QBR of 7.8, half as much as the equally-bad QBR of 16.1 for his counterpart Philip Rivers of the Los Angeles Chargers, even though Smith had a higher completion rate (16/21 vs. 20/40), a better average per completion (7.8 yds vs. 5.9), a far superior TD/int ratio (2-0 vs. 0-3), and won the game handily 24-10. For comparison, the RTG, 128.1 for Smith and 37.2 for Rivers, was by far a better metric of success. Mike Florio of Profootballtalk.com wrote that he'll "continue to ignore ESPN’s Total QBR stat."[15] Rodgers himself was surprised: "I saw the [QBR stats] and chuckled to myself. I played a full game, [Tebow] played the half. He completed four passes, I completed 26. I think it incorporates QB runs as well ... The weighting of it doesn't make a whole lot of sense."[16]ESPN's Stats and Information Group explained that Tebow's higher rating was the result of him staging a partial comeback, taking no sacks, and having positive rushing yards and a rushing touchdown, among other factors.[17][18] However, Doug Farrar of Yahoo! Sports wrote that the QBR system lacks a minimum performance frequency floor that players must meet before they can be rated, and thus it essentially penalizes Rodgers because he played throughout the entire game, while rewarding Tebow because he came off the bench in the second half in an attempt to stage a comeback.[

https://en.m.wikipedia.org/wiki/Total_quarterback_rating
https://ftw.usatoday.com/2015/11/es...tom-brady-behind-ryan-fitzpatrick-what-is-qbr
 
are you talking about the old Rating or new rating which puts more weight on QB effectiveness as opposed to just completions, TDs, INTs.
 
No rating system is perfect and there are always weird discrepancies. The usual QB Rating doesn't take into account fumbles, sacks taken, or weighting situations either. A 10 yard pass on 3rd and 15 is not as impressive as those same 10 yds on 3rd and 8.

The problem is that people look at stats and think it explains the whole story without taking into account how those stats were derived or what they actually represent. Don't blame the stats, blame how people use them.
 

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