The Correlation of PFF Grades to Winning

This is great and proves a couple of things:

#1 The grades that are the worst at indicating actual good results on the field are Passing, Pass Blocking, Rushing, Run Blocking and Run Defense.

#2 While pass blocking is important to winning, from a PFF grade standpoint, it isn't close to being the most important thing to winning. Since most fans point to PFF as evidence the Vikings' Oline has sucked for the past decade or so, it seems fans have been way to quick to put the majority of the blame on the Oline and should focus some of it elsewhere.

So the old saying really is true.  If you can't dazzle them with your brilliance, baffle them with your bull  .

It is a place to start, but any team that used PFF as the only, or even the main source for who to sign, cut or draft, would almost certainly fail miserably.  

Hold on, I thought about this some more and I think I figured out what's going on. The things that seem better at predicting success (higher win%), DEF over OFF, COV over PASS etc, happen less frequently than the inverse. Pass blocking is better than Pass Rush almost twice as often as the inverse, OFF is better than DEF more often, PASS is better than COV more often etc. That means DEF, COV, Pass Rush etc have to be extraordinary to end up better than their inverse, and that's why they end up with a better win% too. That's my theory and I'm sticking to it.

We can't compile our own data with QBR because ESPN doesn't share how the sausage is made xD. Which is why it's a useless system nobody should rely on lol. EPA and traditional QB rating are doable. And I don't know what you mean by OL efficiency. The PFF thing?

I don't see a team or game stat for that, just individual players.

Well it's a whole lot better than people just talking out of their ass lol. I'm not saying PFF is perfect by any means, I've exposed some of its flaws myself ... I mean c'mon, Kirk Cousins had a 76 in the Cowboys game, but Cooper Rush only a 53? But the real problem is with football itself. It's the absolute worst sport when it comes to stats. QB is really the only position where you can compile anything meaningful, which is why I'm hyper fixated on QB's xD. If baseball weren't so lame in every other way, it'd still be my favorite sport, but it turns out I enjoy being entertained when I'm wasting all this time compiling stats.

I think you're talking about the QBR.

They don't just pull the ratings out of thin air. Madden is a computer program that takes those ratings and simulates some sort of result. I'm sure they spend some time fine tuning them to get results that somewhat matches reality. Some would argue they could probably do a better job however, like the fine folks over at footballidiots.

Will this help? Pressure Percentage allowed per team:

www.pro-football-reference.com/years/2021/advanced.htm
Click on the Pressure tab

Ok yeah, I didn't see those stats anywhere, and they do have a weekly version, so I'll see how I can make use of it.