Friday, November 21, 2014

Why "Interceptions Thrown" is a Misleading Statistic


Medical professionals used to think fat was the absolute key to heart disease. If you ate low-fat, you’d be fine. As it turns out, those sugar-filled low fat options aren’t very healthy, and medical professionals have now told us that at least certain kinds of fats aren’t so bad after all. There are even “good fats.” I’m not a doctor, and I don’t play one on TV (or anywhere else for that matter). But I can tell you this: while there’s no “good interceptions,” there are some interceptions are not as bad as we previously thought.

Comparing quarterbacks by how many interceptions they’ve thrown, or even their int % (the percent of their passing attempts that result in interceptions) is downright silly. And yet, interceptions can kill a passer rating or have a drastic impact on even more modern metrics, such as ANY/A (Average Net Yards per Attempt). It’s time to stop the madness. Some interceptions in some situations are awful. Some are bad, and some are irrelevant. We need to start to look at them more carefully instead of just tallying up totals.

It’s not that interceptions are desirable; obviously, they’re not. It’s just that incompletions (or a couple of them), sacks, completions that do not result in first downs, and, in rare instances, completions that don’t result in touchdowns can be as bad or almost as bad of a result as an interception.  I’ll try to go through six of these situations, offer examples, and explain why some interception aren’t always as bad as we think they are. 

THE HAIL MARY INT
THE SITUATION: This one is the most obvious. There’s mere seconds left in the half or the game. The ball is at the 50 yard line. The Quarterback drops back, the defense rushes 2, maybe 3, and drops everyone else into deep coverage. The Quarterback heaves the ball to the endzone, knowing he has little chance of a completion, but also knowing he has no other option. It’s a jump ball, and it’s picked off. SO WHAT.

WHY IT’S NOT THAT BAD: In this instance, an incompletion, a sack, or even a 49 yard pass give the same result as an interception.

WEEK 11 EXAMPLE: Although it wasn’t quite a Hail Mary into the endzone, Jay Cutler, on his own 48, threw an interception with 7 seconds left in the first half. The Bears had no timeouts and were trying to throw a 20 yard pass and get out of bounds. Only a catch and getting out of bounds would have been better than the INT.

THE FOURTH DOWN INT
THE SITUATION: It could be anywhere on the field, but here’s your situation. It is 4th and 3. For whatever reason, the team opts to go for it.

WHY IT’S NOT THAT BAD: Here, it can actually be BETTER to throw an interception than it is to throw an incompletion, take a sack, or even complete a pass that doesn’t make the first down.

WEEK 11 EXAMPLE: Eli Manning, facing fourth and goal from the San Francisco 4 yard line threw an interception that was caught at the 2 yard line. The play actually netted the Giants a 2 yard advantage over an incompletion. I feel obligated to note that Manning did, however, throw four other interceptions in that game.

THE “PUNT” INT
THE SITUATION: Again, you can be anywhere on the field, though this interception is least harmful when it happens on third down. The quarterback goes deep, 40-50 yards down the field, and he hopes his teammate will make a play on the ball. Instead, the defender comes up with an interception, but is unable to return it upfield.

WHY IT’S NOT THAT BAD: This is least harmful on third down because, in those situations, it’s the exact same result as an incompletion or sack and a net punt of 40-50 yards. Now, if you do it on second down, it’s more akin to two completions and a punt (or three incompletions and a punt if done on first down). Chances are though, most people think of an interception as much more harmful than one or two incompletions. In this situation, it’s probably not.

WEEK 11 EXAMPLE: It’s not the best example because it was a first down throw, but Tom Brady’s first interception in the Sunday Night Game was just as good as a punt. Throwing from his own 49, Brady was picked off on a deep ball, which gave the Colts the ball at their own 6. It was equivalent to punt with a net of 45 yards.

THE FAILED COMEBACK ATTEMPT
THE SITUATION: There is less than two minutes left, and the offense has not timeouts, and they’re losing. You give up the ball. Game over. The quarterback then throws an interception, and that’s it. That’s the ball game. 

WHY IT’S NOT THAT BAD: Now we’re starting to get into the less obvious ones, but stay with me here. You need points. An incomplete pass on 4th down later on doesn’t help you, and you need your quarterback to take some risks. Yes, an interception ends the game, but so does anything that doesn’t result in points. And believe it or not, most of these drives do not end with points. If your team loses, you shouldn’t be consoled by the fact that, hey, at least our quarterback threw it away twice on that last drive instead of risking an interception. Glad he could end the day without a turnover. 

WEEK 11 EXAMPLE: I want to give two examples here.

First, is Russell Wilson. Down by four points in the fourth quarter, Wilson and the Seahawks had three drives. Wilson converted one first down on five third and fourth down passing attempts. He didn’t throw an interception, but his team scored 0 points in their three 4th quarter drives, failing to make it past their own 30 on the final drive. Congratulations on not turning the ball over. It didn’t help you.

Second, is Teddy Bridgewater. Down 11 points, Bridgewater led his team on a field goal drive  to pull his team within 8 points, and then down to the Bears 29 before throwing an interception that sealed the game.  In those two drives, Bridgewater was 8/10, 102 yards, and, of course, one interception. His teammates rushed for 2 yards on those two drives. The interception wipes out the value he created on the last drive, but it doesn’t make it a worse effort than Wilson’s.

THE LONG (PASSING) DRIVE INT
THE SITUATION: The run game is getting stuffed. The defense knows the offense is passing. And yet, the offense continues to march down the field. Starting from deep in their own territory, they’re passing for first down after first down. Next thing you know, they’re in or almost in scoring territory. And then, bam, the ball is intercepted.
           
WHY IT’S NOT THAT BAD: Ok, this is one is a little harder to understand, but think of it this way. Your team has the ball at their own ten yard line. What do you want from your quarterback? The drive could end with a Touchdown, Field Goal, Punt, or a turnover (or, hypothetically, a safety). You’d think that a turnover would be the worst end to the drive, but driving down the field and THEN turning it over? It’s actually much better for the team than a three and out would be. Now, if the running game is what drove them down the field, that’s a little bit different (and the quarterback wasted precious run support). But if it’s the quarterback who gets them out of their own territory before the INT, then he’s added more value by doing that, then by going five yard pass, incompletion, sack, punt.

WEEK 11 EXAMPLE: Andrew Luck’s teammates rushed for 4 yards last week. No, not on a particular drive. In the entire game. On one drive, the Colts started at their own 20 yard line. Trent Richardson would have one rush for -3 yards, but Luck started the drive by going  3/3 for 44 yards, getting the Colts into Patriot territory before a pass was deflected and picked off. Yes, it killed the drive, and this kind of interception is worse than some of the others listed above. Still, the Patriots starting field position (their own 32) wasn’t much better than if Luck had strung together a couple of incompletions earlier. It’s not a good play, but the total effort is no worse than a failed drive and a punt.

THE (HOPELESS) FAILED COMEBACK ATTEMPT
THE SITUATION: The team is losing by a lot (or at least more than one score), and there’s not that much time left. The running game usually has been completely abandoned at this point, and only the most optimistic fans have any faith left. The quarterback throws, he throws again, and again. The quarterback throws again and… INTERCEPTED!

WHY IT’S NOT THAT BAD: Well, for one, they probably weren’t going to win anyway. And two, if they WERE going to have a chance at victory everyone knew that they were going to have put up points and put them up FAST. The quarterback had to take risks here, and it’s a lot easier to avoid “costly” interceptions when you’re up 24-3 than when you’re down multiple scores in the fourth quarter. A stalled drive that takes time off the clock doesn’t help. Neither does an interception, but it’s not really any worse in this situation.


WEEK 11 EXAMPLE: Mark Sanchez threw two interceptions, including one that was run back for a touchdown, but he was also in the middle of an impossible position. His first interception came with his team already down 33-6 mid-way through the 3rd quarter. His second came with his team down 46-13 in the 4th quarter. To some extent, he had no choice but to make risky throws. If you want to be able to accurately evaluate Sanchez on the Eagles, try to see how he plays when he’s not down by 30 points in the second half. 

Tuesday, November 18, 2014

2014 Week 11 TAVA Scores

QB
Opponent
Point Diff.
QBSUPP
TAVA
A. Rodgers
EAGLES
33
4.86
2.34
A. Smith
SEAHAWKS
4
2.46
2.23
J. McCown
REDSKINS
20
4.35
1.51
A. Dalton
SAINTS
17
4.23
1.33
M. Ryan
PANTHERS
2
2.95
1.33
T. Brady
COLTS
22
4.96
1.19
R. Tannehill
BILLS
13
4.39
0.80
J. Cutler
VIKINGS
8
3.90
0.79
A. Luck
PATRIOTS
-22
-1.64
0.67
C. Kaepernick
GIANTS
6
3.93
0.56
Z. Mettenberger
STEELERS
-3
1.43
0.40
D. Stanton
LIONS
8
4.29
0.40
D. Brees
BENGALS
-17
-0.43
0.39
B. Roethlisberger
TITANS
3
3.98
0.22
S. Hill
BRONCOS
15
6.07
-0.28
B. Hoyer
TEXANS
-16
0.72
-0.30
R. Mallett
BROWNS
16
6.34
-0.36
K. Orton
DOLPHINS
-13
1.37
-0.52
R. Wilson
CHIEFS
-4
2.42
-0.65
P. Manning
RAMS
-15
1.39
-0.73
P. Rivers
RAIDERS
7
5.91
-0.95
T. Bridgewater
BEARS
-8
2.40
-1.02
C. Newton
FALCONS
-2
3.33
-1.61
E. Manning
49ers
-6
3.59
-2.39
D. Carr
CHARGERS
-7
3.56
-2.44
M. Stafford
CARDINALS
-8
3.67
-2.70
M. Sanchez
PACKERS
-33
1.66
-2.70
R. Griffin III
BUCCANEERS
-20
3.15
-3.11

Friday, November 14, 2014

Wounded Birds


 The Philadelphia Eagles (7-2) sit atop the NFC East, and they look, or looked, like a lock to secure a spot in the playoffs. In addition to that record, however, they now also have a starting Quarterback who is out for the year. The Eagles lost Nick Foles to a broken collarbone and are now starting Mark Sanchez (yes, that Mark Sanchez). Yes, butt fumble, the Sanchize, har har har.

There are plenty of reasons to think the Sanchez-led Eagles are now doomed, but there are also plenty of reasons to think they might continue their success with Mark Sanchez as their starter. No, I’m not joking. Hey, stop laughing. This is a serious article here.

MUCH MORE THAN A QB
Last year, Chip Kelly and Nick Foles took the world (or at least the NFC East) by storm. Foles finished third in TAVA (1.417), behind only Peyton Manning and Aaron Rodgers as he threw 27 TD passes and only 2 interceptions. It was a historic season for the young QB, and the Eagles went 8-2 (including their playoff loss) in games where Nick Foles started and finished the game.

This year, however, Foles (somewhat predictably) came back to reality. His turnovers increased; his touchdowns, completion %, and yards/att all decreased; he missed throws; he held onto the ball too long. The point of this is not to pick on Nick Foles. His TAVA score (0.597) is still decidedly above average, and it stands at11th amongst qualifying Quarterbacks, just above Alex Smith. A lot of teams would love to have a healthy Nick Foles. The point I’m trying to make is that he wasn’t the key to his team in the way that, say, Aaron Rodgers or Peyton Manning are. He wasn’t the sole reason that the Eagles were 5-2 and on their way to 6-2 when he was injured.

And as good as Mark Sanchez has looked in relief, he wasn’t really the key to victory against the Panthers either. In that game, the Eagles scored once on special teams, once on defense, and generated big plays to give the offense the ball inside Panther territory on four separate occasions. This team is much more than their passing offense.

The Eagles lead the league in QB Support with an average score of 4.29 per game, and it’s not exactly close either. The difference between the Eagles and the team with the 2nd best QB Support (The New England Patriots) is greater than the difference between the 2nd best and the 9th best. The Eagles have four games where, ignoring QB play, their win expectancy was above 80 percent (that last game against the Panthers was one of them). Even mediocre QB play will result in a win in those games.

A SCORING DEFENSE IS THE BEST OFFENSE
How are the Eagles doing it? They don’t lead the league in any of the traditional defensive categories. They’re 12th in points allowed and 21st in both yards allowed and opponents 3rd down percentage. And it’s not like their rushing attack (13th in yards/gm and 19th in yards/att) is carrying the load.

So what is it that’s creating all this support? The Answer: BIG plays on defense and special teams. The Eagles are 1st in the league in “net points,” points allowed by the defense and special teams minus the points scored by those units from returns on kicks and turnovers. The defense might be allowing an average-ish 22 points a game, but the defense and special teams are also scoring, on average, 1 touchdown per game. No, that’s not a typo. They are AVERAGING one non-offensive touchdown a game.

And it doesn’t stop with the touchdowns. Excellent special teams play and key turnovers are giving the Eagles offense great field position. The Eagles rank third in field position support, behind only the Bills and the Dolphins.

There is a legitimate question as to whether the Eagles can keep this up. Turnovers, defensive touchdowns, return touchdowns… all these things tend to be slightly more variable than, for example, just stopping the other team from scoring the “traditional way” by forcing three and outs and a lot of punts. But if the Eagles keep creating short fields for the offense, that alone might be enough to tip the scales in their favor down the stretch, even without their starting QB.

THE CHIP KELLY EFFECT
The Eagles support their QBs. Ok, got it. So it would take an especially bad quarterback to sink them if they keep up this effort? Right, that’s good for Eagles fans, right? There’s only one problem. In 2012, the last time Mark Sanchez was a starter, Mark Sanchez was in fact the kind of especially bad quarterback that could sink an otherwise good team. He ranked 35th out of 37 qualifying quarterbacks in TAVA. He regularly lost games with a win expectancy of greater than 50 %, including two games where his team’s QB Support created win expectancies of 68 %, and 89 %!


But there is at least one factor that no statistic will ever be able to take into account: coaching. When Mark Sanchez was with the Jets, he played for Rex Ryan (a great defensive mind) and a series of offensive coordinators of questionable effectiveness (to put it generously). Sanchez now has the opportunity to play for Chip Kelly, a head coach who was hired for his revolutionary offensive mind. We shouldn’t expect Sanchez to turn into an all-pro, but it’s not unreasonable to expect him to raise his game to replacement level or even slightly above league average. And if he can perform at that level? Well, that might be all the Eagles need to win the division. 

Tuesday, November 11, 2014

2014 Week 10 TAVA Rankings

QB
Opponent
Point Diff.
QBSUPP
TAVA
A. Rodgers
BEARS
41
5.73
2.46
M. Ryan
BUCCANEERS
10
2.94
2.12
M. Stafford
DOLPHINS
4
2.97
1.49
STANTON/PALMER
RAMS
17
4.18
1.38
M. Sanchez
PANTHERS
24
5.07
1.30
T. Romo
JAGUARS
14
4.43
0.86
P. Manning
RAIDERS
24
5.76
0.80
A. Smith
BILLS
4
3.57
0.75
R. Wilson
GIANTS
21
5.47
0.72
C. Kaepernick
SAINTS
1
3.42
0.64
J. McCown
FALCONS
-10
0.24
0.62
B. Roethlisberger
JETS
-7
0.98
0.38
B. Bortles
COWBOYS
-14
0.04
0.37
J. Flacco
TITANS
14
5.15
0.28
M. Vick
STEELERS
7
4.41
0.20
B. Hoyer
BENGALS
21
6.46
0.04
Z. Mettenberger
RAVENS
-14
0.56
0.02
E. Manning
SEAHAWKS
-21
-0.07
-0.23
D. Carr
BRONCOS
-24
0.19
-0.70
R. Tannehill
LIONS
-4
2.79
-1.10
K. Orton
CHIEFS
-4
2.89
-1.22
C. Newton
EAGLES
-24
1.21
-1.45
J. Cutler
PACKERS
-41
-0.48
-1.90
D. Brees
49ERS
-1
3.88
-2.34
A. Dalton
BROWNS
-21
2.84
-2.80
A. Davis
CARDINALS
-17
3.22
-2.92