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Skeptical Football: Dynasties, Perfect Kickers And A Weird NFL Rule

In last week’s column, I discussed why Peyton Manning’s comeback record is more impressive from a statistical standpoint than Tom Brady’s. Some people took issue with this — many Brady fans, of course, but also some disinterested parties who objected to using a binomial test to make a comparison between two above-average quarterbacks.1

And then, bam:


Note to the Hacker Gods2: I can fight my own fights, OK? I don’t need your help — especially if you’re going to make it so obvious!

If headlines are to be believed, Monday night could have been the beginning of the end: “Was this the end for Tom Brady and the New England Patriots’ dynasty?” asked Yahoo Sports’ Frank Schwab.

This seems a bit premature to me. But the stakes are as high as they’ve been for the Patriots since, well, since Week 2. Since 1990, teams that won 12 or more games the previous year and started the season 2-2 have made the playoffs 52 percent of the time. That’s hardly the end of the world, but it makes next week’s game pretty high-leverage: Of those teams, the ones that won their next game made the playoffs 65 percent of the time, while those that lost only made it 30 percent of the time.

But what’s at stake for the rest of us is pretty significant as well. We could be on the brink of losing the one thing in football we thought we knew with scientific certainty: that the Patriots are magic.

These Patriots are one of the most interesting phenomena in modern sports. They’ve had 11 seasons with 10 or more wins in a row, good for the second-longest such streak in NFL history (and the longest in the salary-cap era):


Understanding what’s been going on with the Patriots for the last decade and a half (particularly disentangling Bill Belichick and Tom Brady’s effects on each other) is pretty key to understanding the post-salary-cap NFL.3

Chart of the week

In their 41-17 thrashing of Tennessee, Indianapolis had exactly 41 pass attempts and 41 rushes. Balance! The Colts’ number of rushing attempts tied for third-most in the league last week, yet they gained only 2.56 yards per carry, good for fourth-worst.

So let’s keep it simple and use this space for a fun demonstration of a football truism: How often a team runs the ball is mostly a function of whether it’s winning, rather than the other way around. In the chart below, I’ve organized plays by the quarter in which they occurred and what the score differential was at the time of the play, and showed the percentage of those plays that were passes as opposed to runs. (For example, the giant circle in the middle of the first-quarter plot tells us the percentage of passes called on plays from scrimmage when the game was tied in the first quarter: about 56 percent.)


It’s like watching a trend line develop in the womb.

As the game goes on, the pass-versus-run percentages become more and more a function of a team’s lead or deficit.

Interestingly, the overall percentage of passes rises from about 56 percent in the first quarter to more than 64 percent in the second — regardless of whether a team is ahead or behind. That suggests that the trailing team tends to throw more often (presumably to help catch up), and the team that’s ahead also throws more often (maybe to try to put its opponent away). But this likely means there’s some inefficiency in there somewhere: If throwing more is better across the board, then coaches are probably calling too many runs in the first quarter. (Conversely, it’s technically possible that teams are throwing too often in the second.)

In the third quarter, most teams are still throwing more often than they run, but the relationship between margin and play selection crystallizes quickly, and by the fourth quarter it’s very clear. Aside from some smallish outliers, there’s an incredibly steep (and mostly linear) trend between the two: Teams that are substantially down mostly pass, while teams that are way ahead mostly run.

Bizarre NFL rule of the week

While contemplating San Francisco’s terrible decision to kick an extra point when down 2 points against Philadelphia, I came across an interesting stat: Since 2001, teams have scored on fourth-and-goal from 2 yards out only 38 percent of the time but have converted 2-point attempts (which occur at the 2 yard line) 48 percent of the time.

I posed this to Twitter, and got many interesting responses, but here’s the money one:

This led to a long discussion of exactly how “to-go” distances are measured.

If you’re an NFL rules nerd (we are legion) but the official Rulebook just isn’t complicated or strange enough for you, there’s apparently a whole separate 37-page Guide for Statisticians. Here’s the relevant section:

If any point of the football rests on or above any yard stripe, future action is to be computed from that yard line. However, if all of the football has been advanced beyond any yard stripe, future action is computed from the first yard line in advance of the football. The principle is to be followed on all spotting situations, regardless of down, with the following exceptions:

1. In certain situations where there is less than a yard to gain for a first down, it may be necessary to spot the ball back one yard to conform with the principle that there must always be, for statistical purposes, at least one yard remaining to be gained for a first down. This principle also shall be applied when a team loses the ball to its opponent on downs.

Well that explains it!

OK, not really. But it’s interesting that the “yard stripe” is used to approximate the location of the ball and first-down line, rather than rounding or truncating the actual distance between the two. It’s unclear how these things are recorded in real life, but if stat-keepers are using the stripe instead of the chains, that means that identical to-go distances may be recorded differently depending on where the ball is on the field. And, in fact, shorter distances may be recorded as longer than longer ones.

For example:

  • A team carries the ball to the 43.9 yard line for a first down. For statistical purposes, the virtual ball location is at the 43, and the virtual first-down marker is at the 33. On the next down, the team carries it to the 36 exactly. Despite being only 2.1 yards from a first down by the chains, this is recorded as a second-and-3. So far so good, right?
  • Now say the team gets the first down by rushing to the 32 yard line exactly. The new first-down line is the 22. On the ensuing play, a player runs to the 24.9 yard line. This will be recorded as a second-and-2, despite being 2.9 yards away.

So in the one case you’ve left only 2.1 yards, but it is recorded as “and 3,” and in the other you’ve left 2.9 yards but it’s recorded as “and 2.” The only difference is where, between the stripes, the line of scrimmage is located. This makes no sense.

But this shouldn’t be a problem anywhere near the goal, since the end-zone line is fixed. Therefore it does offer a hint at the fourth-and-goal-from-the-2 versus 2-point-conversion discrepancy. These fourth-and-2s could demand anything from 2 yards to 2.99 yards for a first down. But 2-point conversions are always 2 yards exactly. The difference between 2.99 yards and 2.00 yards is huge, making this a likely contributor to why 2-point conversions are successful more often.

Kicking awards for Week 4

I’ve had kickers on my mind a lot lately, so I came up with a fun way of rating MVK (“most valuable kickers”) for a given week. By plotting their points gained above expectation4 versus the amount they contributed to their team’s margin of victory, we get a chart like so:


Most valuable kicker

Our most valuable kicker of Week 4 is Randy Bullock of the Houston Texans. He converted three of three field goals — including ones of 50 and 55 yards — in a game his team won by 6 points, and led the league in points above expectation this week with 2.7. This performance was also pleasantly out of character for Bullock: Last year, in his first playing season, he made only one of five field goal attempts from the 50+ distance.

Least valuable kicker

This is how good kickers are these days: Our least valuable kicker of the week is Shaun Suisham of Pittsburgh, who went one for two with his only miss coming from 50 yards. But that single miss was enough to make him the second-worst kicker of the week by expected points (the worst was Shayne Graham, who missed one from 41 yards) — and his team lost by 3 points, meaning his kick made the difference.

Perfection watch

In 2003, Mike Vanderjagt — the “idiot kicker” who spent most of his career playing with Peyton Manning’s Colts — made 40 of 40 field goal attempts and 58 of 58 extra points (including the playoffs).5 This was only the second “perfect season” by a kicker over a full slate of regular-season games in history (the first was Gary Anderson in 1998), and we haven’t seen one since.

Kickers now may have a harder time getting there, since they’re being asked to take shots from downtown way more often. But modern kickers have gotten so good that they’re up to the challenge, and that will just make it all the sweeter when one of them accomplishes it. Four games into this season, there are still 10 players who have a shot:


Gunslinger of the week

Philadelphia QB Nick Foles did not have a good day against San Francisco. He completed under 50 percent of his passes, for only 195 yards, two interceptions, and one glorious stalled drive that could have given his team the win but came up short. His Passer Rating was 42.3 and his QBR just 22.0.

But Gunslinger of the Week doesn’t discriminate against QBs who have a bad day — and Foles slung it!

His first interception came with 3:07 left in the third quarter with his team down 2 points on a second-and-2 throw that he chucked 48 yards downfield from his own 28. Forty-eight yards downfield is the best place to throw an interception: The pass is practically a punt! San Francisco started its next drive on its own 26 — likely farther back than if Foles had thrown incomplete twice and the Eagles had punted. And counterfactually, if the pass had found an Eagles receiver, the Eagles could have kicked a go-ahead field-goal (at the very least). Also second-and-2 is a great time to throw downfield. With all options on the table, second-and-short is the hardest down to defend.

Foles’s second interception cost his team no more than an incompletion, coming on fourth-and-24 with just 47 seconds left, and I doubt anyone would criticize him for it. But I’d also like to praise the fact that he at least threw the ball 27 yards, meaning he would have gotten a first down if it had been completed. Quarterbacks who face fourth-and-long with the game on the line and dump it make the Gunslinger of the Week trophy weep.

When Foles is behind, he throws downfield. This is sound strategy — it carries bigger rewards, smaller risks, and takes less time off the clock. And of all QBs in Week 4 who had 10 or more attempts with their teams behind, Foles threw the farthest downfield on average, and had the second-highest percentage of his pass attempts going past the first-down marker6:


Gunslinger of the quarter-season

And without further ado, the Gunslinger trophy for the first quarter-season goes to …

Nick Foles.

There have been some very good gunslingers so far this year, but none has been as successful as Foles, who led comeback wins of 17, 14 and 10 points in his first three games. Here’s a plot of how many times a quarterback won versus how far he threw downfield while trailing (for the 10 quarterbacks with the most trailing passes attempted):


Foles’s passes travel the most yards downfield per attempt by far; Joe Flacco is second in that ranking (and he has also managed three wins).

Gunslinging is how good QBs in bad spots still manage to win games.

Rookie QB watch

This week we finally got a full slate of starting rookies, plus an appearance by a (probably) long-shot contender. Here’s how the “best rookie QB career prospects” leaderboard stands:

  1. Jacksonville’s Blake Bortles didn’t have a jaw-dropping day, but his 253 yards and a touchdown (Reminder: For rookies, interceptions and wins/losses matter little) in a loss to San Diego kept him on track.7 He’s in the game and he was drafted the highest — those are the dominating factors for now.
  2. Minnesota’s Teddy Bridgewater had a great win against Atlanta in which he threw for 317 yards and ran for a touchdown. But the data is still sketchy on how much a rookie quarterback’s ability to run is predictive of future success.
  3. And in a shocking rise from clipboard-holder to this hallowed list, the Patriots’ Jimmy Garoppolo went six for seven for 70 yards and a touchdown in garbage-time play in the Patriots’ loss to the Chiefs. This has some people writing what ought to be patently ridiculous articles about how Tom Brady may be done. The Patriots won 12 games last year, but starting 2-2 has people calling for heads. Buuuut … Belichick has pulled the trigger before. From dumping Randy Moss, to letting Wes Welker walk, to benching All-Star Drew Bledsoe for a young … Tom Brady. Could this be Brady’s “Showgirls” moment? Unlikely, but not impossible. But even good spot duty increases the chances that Garoppolo is a legit heir to the throne, and being the next leader of Belichick’s squad would be great for the rookie’s career prospects.
  4. Things aren’t looking great for Derek Carr, who would have topped this list a few weeks ago, but is now out with an injury. And he and his team have been playing so badly that his coach just got fired. Carr threw for just 146 yards against a not-great Miami team, his worst yardage of the season. But he also hit the four starts threshold that has — at least historically — been very predictive, so I won’t dismiss him entirely.
  5. Johnny Manziel had a bye.

Most empirically significant game of Week 5

All that rumination on the Patriots wasn’t just for show. The most empirically significant game of Week 5 is the Pats vs. the Cincinnati Bengals, in New England. In addition to all there is to learn from seeing the crossroads Patriots in action against a potentially very strong team, the Bengals are a worthy mystery in their own right.

Charts by Reuben Fischer-Baum.

CLARIFICATION: We’ve clarified the text to show that Gary Anderson had a perfect kicking season in the 1998 regular season. (He missed a field goal in the playoffs that year.)


  1. Let me rebut that objection as succinctly as I can: For Bayesian inference, understanding the prior probabilities of things is an important and necessary starting point, and getting beyond that is difficult (if possible at all). Some people suggested that I should calculate the difference between Brady and Manning using Brady’s comeback percentage as the baseline instead of league average. But I have no confidence in rates based on a sample of 25. I’m way more confident that Manning is better at comebacks than average than Brady is. And it’s not like that’s a meaningless thing to know: It correlates very well with other metrics that are more difficult to measure. In other words: Start with what we can know, and then go from there.

  2. According to Rene Descartes, if the creators of this universe are less than perfect, we have no basis to ever believe we know anything with certainty.

  3. Note that Peyton Manning is also riding a personal streak of 11 consecutive 10-plus-win seasons himself, over four different coaches between two teams — but it’s far more clear what’s going on with him.

  4. This is similar to “Expected Points Added” or similar stats you might have seen, except this one is based only on the length of the kick and how often the kicker is expected to make it (not taking other factors like field position into account), based on a binomial probit regression.

  5. Granted, with a high-scoring Manning-led offense, he only made one attempt of more than 50 yards.

  6. Adjusted yardage for plays between the 20 yard line and the 10, and excluding plays inside the 10.

  7. If anything, that 78 percent completion percentage is too high! (Half-joking: Completion percentage has a negative coefficient in a predictive regression, but causation is unclear.)

Benjamin Morris is a former sportswriter for FiveThirtyEight.