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<blockquote data-quote="HardRightEdge" data-source="post: 507304"><p>While somewhat helpful around the margins of my questions, the link is not particularly helpful in answering core questions about process, consistency or quality control. The run blocking example is helpful, but it is just one example.</p><p></p><p>Here's an example of an apparent flaw in methodology gleaned from reading this:</p><p></p><p>Let's say Sam Shields blankets his receivers to such an extent he's never thrown at during a game. This has happened, by the way. He would receive a 0.0 pass defense grade for that game because evidently PFF takes the stance there is nothing to evaluate. Unlike O-Line run blocking where 0.0 is a "perfect" grade, we can assume that is not the case with pass defense because we've seen them produce positive and negative scores.</p><p></p><p>On the one hand I agree with PFF's 0.0 grade in my Shields example because, in my opinion, you can't guess about hypothetical outcomes. One might note a receiver got separation on Shields but the ball was not thrown that way. It is conjecture what recovery Shields might have made and what the end result would be. He might actually pick it.</p><p></p><p>On the other hand, being a shut down corner in the purest sense (no targets) should not get a 0.0 neutral grade.</p><p></p><p>Quite a quandary, I must say, to such an extent that one must view these pass defense stats with a pound of salt.</p><p></p><p>It gets worse. Lets say Shields puts up one those Aeneas Williams/Asomugha/Revis seasons where he's thrown on as few as 25-30 times. But on one of those targets he slipped on a bad field and gave up a TD and on another he was expecting safety help deep and it did not arrive, surrendering a second TD. Though we do not have PFF's formulas, we could conjecture that might result in a neutral-to-negative grade. Getting burned for a TD on 7% of the targets might get a heavy weighting in PFF's view.</p><p></p><p>Now, I would <em>not</em> conclude from Shields' league-leading fewest targets per snap last season that he's the best cover corner in the league simply because he covered #2's and #3's almost exclusively. However, a strong argument can be made that he is the best and most feared #2 cover corner in the league. Looking forward, one of the bright spots in the AZ game was Shields making Fitzgerald a non-factor. But wait, what was Shields' PFF grade for that game? I dunno but it could be negative...1 target for 17 yards or 2 targets for 21, I'm not entirely sure which, but I think it was the 1 target. One measurable play and he got beat. </p><p></p><p>I have one final thought on this subject, until other facts are provided, pertaining to the following quote from the PFF link:</p><p></p><p>"There are exceptions and limitations with regards to positions such as wide receiver and defensive backs, where our grading is limited by what the television broadcasters show. Unfortunately, we will continue to be at their mercy until we are able to gain access to coach’s game film."</p><p></p><p>That certainly puts a little different paint job on things. For $40 for the season, they can subscribe to nfl.com and get coach's game tapes. In the mean time, they should beg off rating safeties altogether.</p></blockquote><p></p>
[QUOTE="HardRightEdge, post: 507304"] While somewhat helpful around the margins of my questions, the link is not particularly helpful in answering core questions about process, consistency or quality control. The run blocking example is helpful, but it is just one example. Here's an example of an apparent flaw in methodology gleaned from reading this: Let's say Sam Shields blankets his receivers to such an extent he's never thrown at during a game. This has happened, by the way. He would receive a 0.0 pass defense grade for that game because evidently PFF takes the stance there is nothing to evaluate. Unlike O-Line run blocking where 0.0 is a "perfect" grade, we can assume that is not the case with pass defense because we've seen them produce positive and negative scores. On the one hand I agree with PFF's 0.0 grade in my Shields example because, in my opinion, you can't guess about hypothetical outcomes. One might note a receiver got separation on Shields but the ball was not thrown that way. It is conjecture what recovery Shields might have made and what the end result would be. He might actually pick it. On the other hand, being a shut down corner in the purest sense (no targets) should not get a 0.0 neutral grade. Quite a quandary, I must say, to such an extent that one must view these pass defense stats with a pound of salt. It gets worse. Lets say Shields puts up one those Aeneas Williams/Asomugha/Revis seasons where he's thrown on as few as 25-30 times. But on one of those targets he slipped on a bad field and gave up a TD and on another he was expecting safety help deep and it did not arrive, surrendering a second TD. Though we do not have PFF's formulas, we could conjecture that might result in a neutral-to-negative grade. Getting burned for a TD on 7% of the targets might get a heavy weighting in PFF's view. Now, I would [I]not[/I] conclude from Shields' league-leading fewest targets per snap last season that he's the best cover corner in the league simply because he covered #2's and #3's almost exclusively. However, a strong argument can be made that he is the best and most feared #2 cover corner in the league. Looking forward, one of the bright spots in the AZ game was Shields making Fitzgerald a non-factor. But wait, what was Shields' PFF grade for that game? I dunno but it could be negative...1 target for 17 yards or 2 targets for 21, I'm not entirely sure which, but I think it was the 1 target. One measurable play and he got beat. I have one final thought on this subject, until other facts are provided, pertaining to the following quote from the PFF link: "There are exceptions and limitations with regards to positions such as wide receiver and defensive backs, where our grading is limited by what the television broadcasters show. Unfortunately, we will continue to be at their mercy until we are able to gain access to coach’s game film." That certainly puts a little different paint job on things. For $40 for the season, they can subscribe to nfl.com and get coach's game tapes. In the mean time, they should beg off rating safeties altogether. [/QUOTE]
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