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 Post subject: PFF: Signature Stats: First Downs Allowed – Cornerbacks
PostPosted: Mon Jan 28, 2013 12:22 pm 
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https://www.profootballfocus.com/blog/2 ... rnerbacks/

Signature Stats: First Downs Allowed – Cornerbacks
Khaled Elsayed | 2013/01/28



For five seasons Pro Football Focus has been dedicated to breaking down the NFL on a play-by-play basis like no other. Speaking for the rest of the staff that has meant long hours and an inability to make full use of all the data we create.

Only now the 2012 season is coming to a close, and with PFF more developed, are we starting to really delve into some revealing numbers. The upshot? Shiny, brand new Signature Stats available for discussion before they even hit the premium website — Signature Stats like this one:

First Downs Allowed in Coverage

It’s a relatively simple concept. We wanted to see which cornerbacks not only gave up the most first downs or touchdowns, but also who gave up the most relative to how often they’re in coverage. After all, someone in coverage for 500 snaps is infinitely more likely to give up results to the offense than a player in coverage for 300.

Now to the data.

Chain Movers

Where better to start than the raw numbers showing who gave up the most first downs? In that respect, the first walk of shame belongs to Sean Smith, who was beaten for 40 first downs and six touchdowns in 2012. Those 46 combined first downs and touchdowns were one more than Cary Williams and Patrick Robinson, both of whom had 45 as their magical number. How about that, two of the three are about to be free agents. Interesting.




Name 1st Downs Touchdowns 1st Downs & TDs
Sean Smith 40 6 46
Cary Williams 39 6 45
Patrick Robinson 36 9 45
DeAngelo Hall 41 3 44
Corey Webster 35 8 43
Antoine Cason 38 5 43
Dunta Robinson 38 4 42
Quentin Jammer 34 8 42
Josh Norman 38 2 40
Cassius Vaughn 35 5 40
Tramon Williams 38 2 40


Per Snap Struggles

However, as I said earlier, how can we really judge those guys given their opportunity to give up first downs are widely different to others? So instead of looking at who gave up the most, let’s look at who gave up the highest percentage relative to their coverage snaps (with a minimum of 300 snaps in coverage).

Well, that man would be the Carolina Panthers’ Josh Norman. Life is rarely easy in the NFL, and when you’re a fifth-round rookie thrust into a starting lineup things can go wrong. Norman gave up a first down or touchdown on 8.95% of his coverage snaps, earning his -7.4 coverage grade for the year. Still, rookies will be rookies, and his career won’t be defined by this season.

The man with the second-highest rating is a far more interesting case. With his numbers added up for the two teams he played for Aqib Talib, often tasked with manning up with a team’s best receiver, allowed a first down or touchdown on 8.75% of plays. He may be incredibly talented, but don’t be thinking he’s a shutdown cornerback when you go to pay him.




Name Snaps 1st Downs & TDs 1st Downs & TDs by Snap
Josh Norman 447 40 8.95%
Aqib Talib 343 30 8.75%
Cassius Vaughn 472 40 8.47%
Joselio Hanson 332 27 8.13%
Nolan Carroll 415 33 7.95%
Cortez Allen 340 27 7.94%
Cary Williams 578 45 7.79%
Dunta Robinson 540 42 7.78%
Buster Skrine 451 35 7.76%
Josh Robinson 451 34 7.54%
Derek Cox 399 30 7.52%
Corey Webster 574 43 7.49%
Eric Wright 310 23 7.42%
Sean Smith 624 46 7.37%
A.J. Jefferson 357 26 7.28%
Patrick Robinson 619 45 7.27%
Jimmy Wilson 346 25 7.23%
Quentin Jammer 589 42 7.13%
DeAngelo Hall 625 44 7.04%
Keenan Lewis 531 37 6.97%


The Shutdown Crew

Still, it’s not all bad. While some guys disappointed, others impressed, and none more so than the 49ers’ left cornerback in their nickel package, Chris Culliver. He gave up a first down or touchdown on only 3.45% of his snaps in coverage, a staggeringly low amount when you consider that the next lowest score is that of Leon Hall, with 3.75%.




Rank Name Snaps 1st Downs & TDs 1st Downs and TDs by Snap
1 Chris Culliver 493 17 3.45%
2 Leon Hall 507 19 3.75%
3 Sam Shields 342 14 4.09%
4 Prince Amukamara 434 18 4.15%
5 Casey Hayward 433 18 4.16%
6 Champ Bailey 586 25 4.27%
7 Adam Jones 414 18 4.35%
8 Antonio Cromartie 527 23 4.36%
9 Kareem Jackson 635 28 4.41%
10 Alterraun Verner 579 26 4.49%
11 Robert McClain 379 18 4.75%
12 Chris Houston 541 26 4.81%
13 Richard Sherman 590 29 4.92%
14 Brandon Browner 446 22 4.93%
15 Josh Wilson 658 33 5.02%
16 Brandon Flowers 436 22 5.05%
17 Chris Harris Jr. 493 25 5.07%
18 Antoine Winfield 609 31 5.09%
19 Kyle Wilson 511 27 5.28%
20 Asante Samuel 472 25 5.30%


Sometimes it’s not just about the yards you give up, but the impact of those yards. Do they move the chains or don’t they? There’s a big difference between allowing a 9-yard completion on 3rd-and-10, or giving up a 3-yard completion on 4th-and-2. So looking into who’s giving up touchdowns and first downs is a real indicator of which cornerbacks are truly shutdown.

Stay tuned for more stats like this as the PFF Signature Stat area continues to grow.

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"Vincere scis, Hannibal, victoria uti nescis" -- Maharbal, 216 B.C.E.


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 Post subject: Re: PFF: Signature Stats: First Downs Allowed – Cornerbacks
PostPosted: Mon Jan 28, 2013 12:55 pm 
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As much as I thought Dunta improved this season, I don’t see how anyone would be sad to see him gone.

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R.I.P 2013 season


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 Post subject: Re: PFF: Signature Stats: First Downs Allowed – Cornerbacks
PostPosted: Tue Jan 29, 2013 1:04 am 
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Wow, Robinson scored in both stat lines. It isn't all bad. At least we got rid of Hall. Could you imagine a backfield with Meangelo and Dunta? :rofl:


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 Post subject: Re: PFF: Signature Stats: First Downs Allowed – Cornerbacks
PostPosted: Tue Jan 29, 2013 2:14 am 
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Look at #11 among the best. Robert McClain. Asante at #20.

Not too shabby.


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 Post subject: Re: PFF: Signature Stats: First Downs Allowed – Cornerbacks
PostPosted: Tue Jan 29, 2013 3:32 pm 
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Sad thing is I can see Washington add Robinson if he gets released.

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