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Week 2 Panthers Metrics/Ratings


kungfoodude

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5 minutes ago, Ricky Spanish said:

I don't understand how PFF grades and I'm not sure they do either. 

They explain what they do on their website without divulging any of the proprietary aspects. It's really not super difficult to understand. 

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PFF grades every NFL player on every play on a scale of -2 to +2 using half point increments.[6] The grades are based on context and performance. A four-yard run that gains a first down after two broken tackles will receive a better grade than a four-yard run on 3rd & 5, where the ball carrier does nothing more than expected. A quarterback who makes a good pass that a receiver tips into the arms of a defender will not negatively affect the quarterback's grade on that play, despite the overall negative result for the team.

Furthermore, grades are separated by play type. Beyond just an overall grade, an offensive lineman receives one grade for pass-blocking and one for run-blocking.[7] The average grade is meant to be zero, and raw grades are normalized.

In watching every game, PFF is also able to record information and create data that is typically unavailable. One example is how frequently individual offensive linemen yield pressure.

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PFF has been criticized by the analytics community regarding the accuracy and veracity of its ratings.[9] In contrast to the purely quantitative ratings released by sources like Football Outsiders, TeamRankings, and numberFire, PFF uses qualitative and opinion-based grading as the root of its 0-100 Player Grades -- not its advanced statistics. As such, the 0-100 Player Grades are not truly quantitative and could be seen as being prone to bias, poor sample sizing, or other issues.

 

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the positional rankings for some Panther defenders is.....well.....worse than expected.   And the bar was practically resting on the ground. 

BUT, we gotta keep in mind this is a new system they are working with new bodies.  No preseason to work on it.  It is, like I said, to be expected.   More about how the end of the season looks than beginning.  2nd half of the season is where we can start to judge people harshly. 

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4 minutes ago, hepcat said:

I don’t need numbers to know which players are terrible. Watching the games in real time can tell me that.

Watching games in real time as a fan isn't a great way to grade players unless the TV broadcast is highlighting them regularly. To do what PFF does(or really any detailed subjective grading for general scouting purposes) you have to watch the game with a focus on that individual player on each down. Obviously people with extensive football experience(as players or coaches) can pick stuff out quickly but the average fan isn't as capable of doing that. It's a lot of information to crunch at one time when you are looking at 22 players on each 3-10 second play. 

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1 hour ago, kungfoodude said:

They explain what they do on their website without divulging any of the proprietary aspects. It's really not super difficult to understand. 

 

The main issue I have with them is I don’t think the evaluation/grading is consistent with each member of their staff, and then try to put it all together for rankings.

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1 minute ago, t96 said:

The main issue I have with them is I don’t think the evaluation/grading is consistent with each member of their staff, and then try to put it all together for rankings.

Yeah, anything that is subjective with multiple inputs is going to be that way. Supposedly each player gets two independent graders each week to attempt to flatten out the bias. I do think that over the course of the season those instances of bias will likely get somewhat cancelled out. 

It's definitely far from a perfect process, largely because it is ultimately subjective. 

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2 hours ago, kungfoodude said:

Watching games in real time as a fan isn't a great way to grade players unless the TV broadcast is highlighting them regularly. To do what PFF does(or really any detailed subjective grading for general scouting purposes) you have to watch the game with a focus on that individual player on each down. Obviously people with extensive football experience(as players or coaches) can pick stuff out quickly but the average fan isn't as capable of doing that. It's a lot of information to crunch at one time when you are looking at 22 players on each 3-10 second play. 

True. But do I really need to watch the All 22 to know that Tahir Whitehead has been playing terribly?

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