Don't have an account?
Join the Best Live Fantasy Chat Community!

Lost password? [X]

Receive free daily analysis:

NFL    NBA    MLB

Already have an account? Log in here.

[X]

Forgot Password


[X]

NFL NextGen Stats Analysis for Fantasy Football: Introduction


At this point in time, there is no excuse for you to not get the statistics being used in every sport you follow and their importance. Back in the day, it was all about wins and losses, passing yards, and touchdowns scored. It is not that those stats are worthless, but they don't offer much to the savvy analysts. While football is yet in its infancy in terms of analytics compared to baseball, the evolution the sport has seen lately in those terms is notable.

One interesting advancement in the NFL world is related to player tracking. The league calls it Next Gen Stats, and it boils down to capturing and crunching location data. This allows getting information about the players' position in the field, their speed, how they move, etc. I know you're a busy individual looking for a shortcut to get the best possible fantasy football results without spending tons of time researching, so I decided to launch this series for the 2019 season.

I will be writing weekly about NFL's Next Gen Stats and how they can be used in fantasy leagues. Watch this space every Wednesday for a new take on some fancy metrics. I will be working on a rolling basis, discussing different stats each week to keep things fresh and cover as many information and players as possible. As you might not be familiar with some of the stats I will talk about in here, I thought it could be interesting to run an introductory post in which I will hand out some definitions and show data from 2018. You can use it to get familiar with some names and acronyms, to start understanding where they can help you with your fantasy decisions, and also to attach some players' names already to the different stats so you get a quick idea of what we're talking about and what you can expect going forward. Let's get started!

Editor's Note: Get any full-season NFL Premium Pass for 50% off. Our exclusive In-Season Lineup Tools, Lineup Optimizer and over 150 days of Premium DFS Research. Sign Up Now!

 

It's All About Air Yards

If you are still not aware of them, Air Yards are the new cool kid in town. They are mostly used for both quarterbacks and wide receivers/tight ends, and I will focus on that latter. Basically, Air Yards tells us the vertical yards on a pass attempt from the line of scrimmage to the point where the ball was caught by the receiver (or the catch failed to be completed.)

I will be using mainly two metrics here: Average Targeted Air Yards (TAY), and %Share of Team's Air Yards (TAY%).

TAY tells us how many air yards a receiver is thrown per target. This is the number of yards the passes he's thrown fly from the line of scrimmage to the point where he attempts the catch. It allows knowing how far down the field a receiver is targeted on average, or how much of a deep/short threat he is.

I have charted the five-best and five-worst receivers in YAC from the 2018 season. As you can see, plenty of names you probably expected here appear at the top of the list as they are mainly deep threats, while tight ends crowd the bottom as they normally run shorter routes.

Player Position Team TAY
Robert Foster WR BUF 20.6
DeSean Jackson WR TB 19.1
Robby Anderson WR NYJ 16.5
Kenny Stills WR MIA 16.4
David Moore WR SEA 16.4
Jarius Wright WR CAR 5.7
Jeff Heuerman TE DEN 5.7
Vance McDonald TE PIT 5.7
Evan Engram TE NYG 5.1
Ryan Switzer WR PIT 3.2

Let's move on to TAY%. In this case, we're looking at the broad picture. Instead of focusing on the passes thrown exclusively to a certain player, we are analyzing his opportunities among all the receivers of a team. TAY% measures the percentage of Air Yards a receiver was thrown at over the sum of his team's total Air Yards.

Here are the 2018 leaders and trailers:

Player Team Position TAY%
Julio Jones ATL WR 45.64
DeAndre Hopkins HOU WR 44.04
Tyreek Hill KC WR 38.16
Kenny Golladay DET WR 37.56
Antonio Brown PIT WR 36.07
Nick Vannett SEA TE 6.78
Gerald Everett LAR TE 6.56
Cameron Brate TB TE 6.46
Jeff Heuerman DEN TE 6.24
Ryan Switzer PIT WR 2.67

As you can see, this is much more telling of the true level of a player than the raw TAY metric. We find elite receivers at the top of the list (the players that are actually trusted by their quarterbacks and therefore thrown the ball more), and not-so-great ones at the bottom (including, again, our beloved tight ends). A player doesn't need to have a huge TAY to be the most productive guy if he's getting thrown the most times even if he's running shorter routes. Remember: you should always focus on volume over everything.

 

Ballcarriers, Head North!

This is an old debate. Do you prefer a patient running back with great instincts, or would you rather bet on your typical smashmouth, head-first beast that just relies on brute force to make a way for himself?

We can define runners in terms of how they move, and how quickly they do so. Two advanced stats allow us to measure these things: Efficiency (EFF) and Time Behind the Line of Scrimmage (TLOS).

With EFF, we look at the total number of yards (both vertical and horizontal) the rusher traveled in comparison to the vertical yards he gained. If he gains 10 yards traveling another 10, we know he ran a straight line forward for an Efficiency of 1.0. If he gained 10 yards but traveled 20 total yards, he had an 0.5 Efficiency as 10 of those 20 yards didn't give his offense any real advancement up the field. Here are the five most and least efficient runners of 2018:

Player Team EFF
Gus Edwards BAL 2.78
Frank Gore MIA 3.13
Phillip Lindsay DEN 3.39
Kerryon Johnson DET 3.41
Christian McCaffrey CAR 3.44
Alex Collins BAL 4.91
Tarik Cohen CHI 4.96
LeSean McCoy BUF 5.07
LeGarrette Blount DET 5.1
Elijah McGuire NYJ 5.2

Any Efficiency mark under 3.15 is almost unheard of. What Gus Edwards did in 2018 was just ridiculous. No player ran less and gained more than he did when he rushed the ball. Other great RBs appear on the list, making it clear they're not in for the waisting of their legs and yards in vain. On the other hand, Blount and McCoy covered much more space laterally than they ultimately gained forward as their high EFF numbers show.

As for TLOS, we're getting just what it stands for: the amount of time a rusher spends before crossing the Line of Scrimmage, no matter if the RB uses that time standing still in the back of a lineman waiting for an opening, or just moving east/west trying to break through some hole. High or low TLOS values don't correlate with better or worse efficiency, mind you. Le'Veon Bell is a patient runner (3.11 TLOS in 2017), and one of the most efficient rushers. On the other hand, Carlos Hyde averaged the second-highest TLOS last year but only logged a paltry 3.3 yards per attempt. Here are the slowest and fastest RBs to cross the LOS in 2018:

Player Team TLOS
Gus Edwards BAL 2.43
Frank Gore MIA 2.53
Jordan Howard CHI 2.55
Mark Ingram NO 2.58
Leonard Fournette JAX 2.63
Nick Chubb CLE 3.01
Rashaad Penny SEA 3.01
Alex Collins BAL 3.01
Carlos Hyde JAX 3.02
Tarik Cohen CHI 3.34

 

Receiving DIYers

I have already introduced you to the Air Yards concept. While both TAY and TAY% give us a good idea of how deep down the field receivers are used, and how important they are for their attacks in terms of intended usage, we still don't know much about what they do once they get the ball in their hands. Enter Yards After Catch (YAC).

Nothing hard to understand here. YAC measures the yards gained by a receiver after he catches the ball. A deep threat that is able to catch the ball way down the field is a good receiver. A deep threat that does that and then adds another extra five-to-ten yards is a great one.

Look at the top and the bottom of the 2018 leaderboard:

Player Position Team YAC/R
George Kittle TE SF 10.2
Evan Engram TE NYG 9
D.J. Moore WR CAR 7.9
Vance McDonald TE PIT 7.9
Quincy Enunwa WR NYJ 7.7
Zay Jones WR BUF 2.6
Daesean Hamilton WR DEN 2.4
Cameron Brate TE TB 2.1
Devin Funchess WR CAR 1.8
Chad Williams WR ARI 0.9

Although not as important or impactful as the other Air Yards concepts, YAC are also valuable for both the receivers and their quarterbacks. Air Yards alone award points to the QB as they are strictly linked to the pass (if it is completed). YAC are good for both the receiver and the QB. The receiver gaining more yards means he gets more points. The quarterback, but virtue of the receiver extending the offensive gain, also gets more yards assigned to his pass and more points by extension. Although not game-breaking, always look for high YAC values when assessing WR/TE ability and consider it when stacking QB/WR/TE groups in your lineups.

 

Expected (and Unexpected) Outcomes

Thank you for still being with me. If you have made it to this point, nothing will keep you from understanding this last bit of information! After touching slightly on them in the last section, we're looking deeper at quarterbacks here to close this introduction.

A key metric for passers is their Completion Percentage (COMP%). This is nothing new. Just take all the completed passes from a quarterback and divide them by the total number of passes he has thrown. Keep in mind, though, that it takes two to complete a pass. The quarterback can be as good as the best one, but if the receiver he's throwing the ball to has buttery hands and always drops the ball, the QB's COMP% will be always dragged down.

Take a look at the best and worst passers in terms of COMP% in 2018:

Player Team COMP%
Drew Brees NO 74.4
Nick Foles PHI 72.3
Kirk Cousins MIN 70.1
Carson Wentz PHI 69.6
Matt Ryan ATL 69.4
Jeff Driskel CIN 59.7
Lamar Jackson BAL 58.2
Sam Darnold NYJ 57.7
Josh Rosen ARI 55.2
Josh Allen BUF 52.8

As I already mentioned, COMP% is linked to both the quarterback ability and his group of receivers. Take Drew Brees. He is one of the best QB to ever play, and he also had otherworldly receivers in Michael Thomas and Alvin Kamara (in terms of Catch%). Nick Foles, though? I'm sure you didn't expect to find his name as high as it is, but his receivers and league-low tendency to look for short completions helped him make the most out of his throws.

At the bottom of the table, the five names to appear there were all rookies. It takes time to get the grips of the NFL, and things get even harder if the guys at the other end of the field are not very good at catching the ball or you just throw bombs downfield.

The final thing to keep in consideration is that not every pass has a unique outcome depending on the situation. Not every throw from Matt Ryan to Julio Jones from Atlanta's five-yard line that flies 15 yards through the air until it reaches Jones is caught exactly 85% of the times. But NFL Next Gen Stats have built a model that uses completion probability (based on thing slike the receiver's separation from the defenders, its position on the field, the time took by the passer to throw, etc) to give each pass an Expected Completion Percentage (xCOMP).

For us, xCOMP is important because it can be directly compared with COMP% to see whether a quarterback is over or underachieving. By looking at the difference between COMP% minus xCOMP% we get the quarterback's Completion Percentage Above Expectation (+/-).

It will be easier to get the idea under that concept looking at the leaders and trailers of the metric in 2018:

Player Team COMP% xCOMP% +/-
Drew Brees NO 74.4 67.6 6.9
Nick Foles PHI 72.3 67.4 4.9
Russell Wilson SEA 65.6 61.4 4.2
Kirk Cousins MIN 70.1 66 4.1
Matt Ryan ATL 69.4 65.3 4.1
Josh Rosen ARI 55.2 59.7 -4.5
Lamar Jackson BAL 58.2 63.5 -5.3
Blake Bortles JAX 60.3 67.8 -7.5
Josh Allen BUF 52.8 60.5 -7.7
C.J. Beathard SF 60.4 68.4 -8.1

You shouldn't misjudge the +/- values as just plain luck if positive, bad luck if negative. Keep in mind that the model for xCOMP% gives an average estimation to the rate a given pass/situation should end on a completed pass for the average quarterback and throw withing those parameters. This means great quarterbacks are probably going to surpass expectations (that is what makes them great), poor quarterbacks will fall short of expectations (negative +/-), and the rest of the field will be just there floating around the neutral-zero +/- value.

Drew Brees is a living legend. It is normal he is playing above what we could expect from the average thrower. C.J. Beathard, on the other hand, was a backup forced into San Francisco's lineup in 2018 and he did what he could. Not saying he wasn't unlucky here and there in some plays, but he still fell way short of expectations and that also exposed his below-average level at the position.

Nick Foles appears here again as the first-best human to make the list behind alien-ish Brees. We should take his COMP% with a grain of salt given the rest of his stats (never use a single number as the be-all and end-all when assessing a player's ability!) In this case, we would discover he probably finished the year a little over where he should have truly ended. For those at the bottom of the list, it took time to Josh Allen to get how the NFL works, but such a mediocre COMP% should positively regress at least a bit to what he showed in college (56 COMP%) and his last game of the season (65.4%)

 

Conclusion

That is all I will be bringing to you this upcoming season. Don't close your research to just the classic statistics that have been out there for ages. Dig deeper. Move to new ways of analyzing players. Gain an edge over your league mates. Use all of the data you can and field the best lineup each week if you really want to win.

And don't worry if you don't have much time to study all of this stuff by yourself. I will be here to help you each week!

More Fantasy Football Analysis




More Recent Articles

 

Week 14 Chat - Live Fantasy Football Game Day Q&A

It's Sunday Morning Week 14... Do You Know Who to Start? Each Sunday morning of the NFL season, RotoBaller's experts will be moderating the industry's leading live chat room and answering a bunch of your fantasy football questions, from around 10:30 AM to 1:00 PM ET. Come join in on the fun, and get your... Read More


Updated Week 14 PPR Rankings (Top 300)

Welcome to Week 14 RotoBallers. Below are our updated consensus Week 14 PPR rankings for fantasy football, including some running notes on relevant injuries, player news and rankings updates: Josh Jacobs (shoulder) is a game-time decision. Will Fuller (hamstring) is expected to miss Week 14. Adam Thielen (hamstring) has officially been ruled out. Le'Veon Bell (illness)... Read More


Fantasy Football Mailbag - Q&A for Week 14

This article's content may vary week-to-week, but generally, it will be answering questions fielded from either the @RotoBallerNFL twitter account or my personal one (@RotoSurgeon). This week, the focus is on start/sit questions, and there were plenty. Every week, many of us struggle with which quarterback to start, or who to flex, and I am... Read More


Fantasy Football Starts and Sits: Matchups Analysis for Week 14

Welcome to our Week 14 matchup analysis and start/sit column for fantasy football. We'll be covering every single contest from the Sunday slate in one convenient location, helping you make the best decisions for your fantasy lineups. Be sure to check back regularly because this article will be updated as news comes in regarding injuries and other... Read More


Monday Night Fantasy Football Starts/Sits - Week 14

Finally, we had a good fantasy matchup last week. And now, as punishment, we get this. The Eagles against the Giants is a good rivalry game. But for fantasy? Not so much. Even key players Saquon Barkley and Carson Wentz have been severely disappointing in 2019. The game is not going to be something to... Read More


Fantasy Football News and Injuries - Running Updates

Below is a quick-hit list of running notes on relevant injuries and player news, including pre-game reports and live in-game updates. Stay tuned for updates all throughout the week and on Sunday morning game day:   Week 14 Will Fuller (hamstring) is expected to miss Week 14. Adam Thielend (hamstring) has officially been ruled out. Le'Veon Bell... Read More


Wide Receiver Matchups To Target In Week 14

In Week 13, Davante Adams and Tyreek Hill were the high-end options that had great matchups. Adams had a huge two-touchdown game while Hill only came up with 55 scoreless yards, falling victim to game flow as the Chiefs led from start to finish, scoring a defensive touchdown in the process. Several of the wide receivers... Read More


Week 14 Fantasy Football Staff Rankings

Below you will find all of RotoBaller's fantasy football weekly rankings, tiers, player news and stats for the 2019 NFL season. Our Ranking Wizard displays our staff's rankings for various league formats, all in one easy place. Here's what you'll find: Weekly PPR Rankings Weekly Half-PPR Rankings Weekly Standard Rankings Dynasty League Rankings     Fantasy... Read More


Week 14-16 Playoff Defense (DEF) Streamers and Starts - 2019 Fantasy Tiers, Rankings

The playoffs are here, and that means we're going to do things a little differently. I want to take a look at the playoffs as a whole (and in this case we are considering Weeks 14-16) and determine which DSTs you can ride all the way through and which ones you should stream this week.... Read More


Key Starters and Tough Calls - Lineup Spotlights for Week 14

Welcome to Week 14, RotoBallers! Below you will find some of my spotlight plays and tough lineup decisions for the upcoming week of the fantasy football playoffs. These player selections are based on my Premium Weekly Lineup Rankings, available as part of the RotoBaller's NFL Premium Pass. Enter promo code KING at checkout for a... Read More


NFL Survivor Pool Picks (Week 14) - Targets and Avoids

If there were a dozen people left in a survivor pool this past week, odds are those pools are down to just several. The upsets began Thursday when the Bills beat the Cowboys, and continued Sunday when the Dolphins and Redskins won as 10-point underdogs. If you're somehow still alive in your pool with just... Read More


Week 14 Stream Team - Free Agent and Bye-Week Streamers

Now that the playoffs are beginning in most leagues and the final march for a championship has begun, streaming becomes a  necessary strategy. Knowing who to add and when to start them could be the ultimate difference-maker in a weekly matchup. Making the right streaming decisions could easily be the difference in winning a championship.... Read More


Fantasy Football Playoff RB Handcuffs: Add Them Now!

The fantasy football postseason has begun, so it’s time to re-evaluate your depth, especially at running back. With only three weeks left on most fantasy scoreboards and each matchup possibly being your last, there is no more time for stashing players for potential contributions later. You also cannot waste roster space on guys who will... Read More


Fleaflicker's Most Added and Dropped: Week 14

Week 13 just served to remind us all that anything can happen in the National Football League and that you can't ever look past the New York Jets when you're trying to lose. The Cincinnati Bengals learned that lesson on Sunday, beating the Jets handily in a game that wasn't even as close as the... Read More


Playoffs Panic Room? Outlooks for Slumping WRs and RBs

As your fantasy football playoffs open, some of your projected starters have not performed up to expectations in recent weeks. But knowing their track records of production in the past and/or earlier this year, it may be hard to sit them. You want reassurance on some of these suddenly lackluster players before the postseason begins.... Read More