Lastly, the resulting adjusted EPA per play is transformed to a 0 to scale, where 50 is average. The result can be thought of as a percentile. Think of QBR as an attempt to rate a quarterback by difficulty. A quarterback gets more credit for success in more difficult situations, and less credit for success in less difficult situations. It tries to reward QBs for making the clutch throws downfield versus an easy swing pass on second down. Passer Rating is the official NFL measure of quarterback performance, and its calculation is much simpler than the QBR , as it depends only on aggregate statistics rather than an analysis of each play a quarterback is involved in.
Additionally, passer rating double counts completion percentage, favoring quarterbacks who tend to throw screens and other short passes. It ignores sacks, fumbles, designed runs and scrambles. It also does not put plays into any context. For example, while the QBR treats a 5-yard gain on second-and-5 as very different from a 5-yard gain on third-and, passer rating treats all yards , whether they are air yards or yards after catch, as equal, and belonging to the QB. The NFL passer rating formula includes four variables: completion percentage, yards per attempt, touchdowns per attempt, and interceptions per attempt.
Each of those variables is scaled to a value between 0 and 2. When the formula was first created, a The key here is that all plays are treated equally by the passer rating formula.
There is no attempt to make one play more or less important than another. He also could have completed the pass when under duress or thrown it from a clean pocket. That means on completed passes, the EPA is divided among the quarterback, his receivers and the offensive line based on how far the ball travels in the air, what percentage of the yards were gained after the catch compared to how many yards after catch are expected and whether the quarterback was under pressure.
This division of credit is based on statistical analysis of thousands upon thousands of NFL plays. In this sense, QBR knows that Cousins was helped by his receiver, who gained fewer yards after the catch than expected given where he caught the ball, but hurt by his offensive line. The details of every play air yards, drops, pressures, etc. Every play of every game is tracked by at least two different analysts to provide the most accurate representation of how each play occurred.
Before moving on to the next play, QBR asks one more question: Did this play come in garbage time? This process of determining the EPA, dividing credit among the QB and his teammates and then determining the weight of play occurs for every play in which a quarterback is involved.
All of these plays are then added together and divided by the total number of clutch-weighted plays to produce a per-play measure of QB efficiency. That last piece is important!
QBR is an efficiency stat similar to yards per play or yards per attempt. Therefore, Cousins might have provided more total value than Rodgers because he was involved in more plays, but on a per-play basis, Rodgers was significantly more efficient. The scaling process is a fairly standard logistic regression that produces a number that is easier to grasp. On a game level, however, a QBR of 75 means that holding all other factors constant defense, offensive teammates, etc.
Skip to main content Skip to navigation. Remember that QBR is a measure of efficiency, rather than total production, and this game is almost as efficient as it gets. No player rating system can be perfect, but we think adjusting for opposing defenses is one more step forward for measuring total quarterback performance. Skip to main content Skip to navigation. How is Total QBR calculated? We explain our improved QB rating. Cincinnati Bengals. Los Angeles Rams. Las Vegas Raiders.
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