Around halfway through the 2019 regular season, we presented the idea of survival curves, a new way to look at pass protection and pass rush.
These survival curves describe how often a quarterback faces pressure after holding on to the ball for a certain time after the snap. Back then, the analysis was only in hindsight, as we simply looked at how often an offensive line kept the quarterback clean at various points after the snap. But the important improvement upon usual pressure rates is that the evaluation of the offensive line — and the defensive line for the other side of the ball — is independent of how long the quarterback holds onto the ball.