Advanced Defensive Stats: Pass Rush

| June 28th, 2021

Over the next few days, I want to look at advanced defensive statistics from Pro Football Reference to better examine some of Chicago’s individual defenders as we prepare for the 2021 season. Today will focus on pass rush, while upcoming articles will examine missed tackles and pass coverage.

On the surface, Chicago’s pass rush was not terribly impressive last year. The Bears finished with 35 sacks (17th in the NFL) and 137 pressures (23rd). They pressured QBs on only 22.4% of dropbacks, which ranked 21st of 32 NFL teams. I’ll note here that pressures can be a somewhat subjective stat, and thus they differ a bit from source to source. Pro Football Focus, for instance, had the Bears as the 4th best pass rush in the NFL.

I don’t have access to PFF’s data, however, so I’m going forward with Pro Football Reference numbers. I specifically want to hone in on pressures today, because those tend to be a more reliable measure of pass rush effectiveness than sacks. Last offseason, I found that, on average, NFL players get about 3.8 pressures per sack. This allows you to get a feel for expected sacks (pressures/3.8), which you can then compare to the actual sacks to see which players got lucky (more sacks than expected) or unlucky (less sacks than expected). I found there is no carryover from one season to the next in this stat, so it gives us an idea of what players we might expect to bounce back the upcoming season.

When looking at league-wide data for 2020, I noticed that total sacks seemed lower. The pressure numbers were about the same (105 players had 15+ pressures in 2020 compared to 107/year in 2018-19, 36 players had 30+ pressures compared to 32 per year in 2018-19) but I found there were 4.3 pressures per sack in 2020. My hypothesis is that the NFL calling fewer holding penalties led to more pressures where the pass rusher couldn’t finish the play. Either way, I used the 4.3 pressures/sack number to get the expected sacks for Bears players in 2020, and you can see how they did compared to their actual sacks below. Players in green outperformed their expected sack total by at least 1 sack, while those in red underperformed by at least 1 sack.

A few thoughts:

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