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Playing the Numbers Game: Red Zone Offense

Billyzane's look at the game through the prism of numbers returns with a look at the red zone.

The Red Zone is fake.  

Now that I’ve got your attention: it’s not really fake.  But what defines it is wholly arbitrary and makes it borderline useless.  Is what you do on offense inside the opponent’s 20-yard line more important than what you do on any other yard line?  That depends on what type of team you are.  If you’re a big play team that scores on lots of long touchdown plays and has a kicker with a very strong leg, you don’t have to be particularly good at doing anything in the red zone in order to win games.

But if you’re a team that’s racking up a lot of offensive yards but not scoring as many points as you would expect off of those yards, then what you do in the red zone surely is more important to winning games than what you do in the rest of the field.  An accumulation of yards generally leads to an accumulation of points, but not always.  When it doesn’t, the culprit is generally one or both of those problems: 1) an inability to score on long plays, and/or 2) an inability to operate effectively in the red zone.  The main complaint about Texas’ offense this year has been about the latter.  But in order to figure out whether it’s really a problem, we need to determine what constitutes a "success" in the red zone. And to do that, we need to figure out what exactly the point of the red zone is.

Click here to read the rest of this entry.

Star-divide

What is the Red Zone?


If you guessed body wash,
allow me to redirect you here.

In the box score, red zone scoring percentage is the number of times you come away with any points on a drive in which at least one snap occurred in the red zone divided by the number of such drives.  But is "points" the definition of success?  It’s you’ve got 1st and goal on the 2, a field goal is more or less a failure.  It’s better than 0 points, but still less than any team should come away with in such a situation.  But what about 3rd and 9 at the 20-yard line?  A field goal in that situation might be considered a success.

Thus, we need to take a step back and define what the "Red Zone" really is.  I define it as the area of the field within which an offense should expect to score at least some points just by being there.  That is, by virtue of taking at least one snap in this "zone," you should score some points.  Thus, I think the traditional notion of the "Red Zone" should be extended to the 30-yard line from the 20 because a field goal attempt snapped at the 30 yard line is 47-yards, the upper limit for what I think is reasonable in the college game.  Perhaps the limit is more accurately somewhere in between 25 and 30 yards, but round numbers make things easier.  Either way, this is called the "Scoring Zone."  You expectation of scoring some points when you reach this zone should be around 100%.

But it also becomes clear that not every yard line in the "Scoring Zone" is created equal.  Your expectations of success from the 30-yard line and from the 5-yard line are quite different.  Thus, I propose breaking the Scoring Zone into four sub-zones.  From the 30 to the 21 is the Yellow Zone.  From the 20 to the 11 is the (Burnt) Orange Zone.  From the 10 to 6 is the Red Zone.  And inside the 5 is the Touchdown Zone.  Your definition of "success" varies depending on which zone you are in.  If you’re in the Yellow Zone, then a successful offense will either score a TD from the Yellow Zone or will advance beyond the Yellow Zone (to the Orange or beyond).  This demarcation allows us to more accurately pinpoint where the problems in the Scoring Zone offense arise.

But that’s not all that matters to determining what constitutes success, of course.  The goal of a Scoring Zone offense is almost always to score touchdowns.  But if your first snap inside the 5-yard line is on 4th down, you can’t have the same expectations of success on the drive as if your first snap inside the 5 is on 1st down.  Here is a chart giving what I believe to be relatively accurate expectation levels for a good Scoring Zone offense to "succeed" (advance to next zone or score a touchdown) based on downs (Yellow and Orange are different than Red and Touchdown because the former zones are 10-yards long and the latter are only 5):

Effectively, this means that if you have a first down in any of the zones, a good Scoring Zone offense should advance to the next zone (or score a touchdown) before fourth down 100% of the time, and so on.  For example, say you have second down and 10 at the 23 yard line (the Yellow Zone) and on the first play you gain 4 yards.  You have succeeded in the Yellow Zone (by advancing to the Orange Zone – the 19-yard line).  Now you have third down and 6 at the 19.  Your expectation of "success" in the Orange Zone (i.e. advancing to the Red Zone) is not particularly high, even for a good Scoring Zone offense.  Thus, not advancing to the Red Zone in this situation is not as poor a reflection on the offense as it would be if they had failed with a first down at the 19.

Additionally, facing third down and goal at the 6 yard line and only getting 4 yards, giving you fourth and goal at the 2 shouldn’t be considered a success either, even though the offense advanced from the Red Zone to the Touchdown Zone.  If the team advances to the next Zone but doesn’t get there until it’s fourth down, that’s not a success because there’s nowhere else for the offense to advance.  That’s a failure.

Grading Scoring Zone Success

This is based on the highest down you have within the zone.  So, if it’s 3rd and 2 at the 15 and the offense converts and it’s now 1st and 10 at the 13, your expectation of success in the Orange Zone is based on that first down, not the previous third down.

If you succeed with a first down in a given zone, you get 1 point.  If you succeed with, at best, a second down in a given zone, you get 1.2 points (based on the greater degree of difficulty).  For third down, it’s 1.5 and for fourth down, it’s 2 points.  If you fail to convert you get negative 1 point if you had a first down at some point in that zone, negative .8 points if the best down you had in that zone was second down, negative .5 points if it was third down and 0 points if it was fourth down and you went for it and didn’t get it (you get a "--" if the best down you had in a zone was 4th down and you tried for a field goal).

If the team turns the ball over (on downs, fumble, interception, or by punt) or misses a field goal, I will make a note of it in the success charts below.  However, while it is important to the overall success of a drive and to the game, I don’t think it has any bearing on the quality of a team’s Scoring Zone offense beyond the fact that it’s a "failure."

[note: in the charts below, there is only a success or failure score (or dashes) if the offense took a snap in that zone on that drive]

Performance against UCF

Performance against TCU

Performance against ASU

Performance Overall in First 3 Games by Zone

Analysis

I’m going to keep amassing this data for the rest of the year and report back to you at some point with a far better sample size, but is there anything we can already see so far this year?  Well, obviously, when you reach the Scoring Zone, you always want to come away with some points because you’re already more or less in field goal range.  And yet, as you can see in the far right column of the last chart, in 6 of Texas’ 17 trips to the Scoring Zone, they came away with nothing.  However, while you can obviously blame the lack of a touchdown on the weakness of the Scoring Zone offense, but I don’t think you can blame the offense for missed field goals if they were within a reasonable range.  For that reason, when looking at this data to determine the strength of the offense, instead of looking at them as "scored points vs. didn’t score points," I think we should be categorizing these attempts as "Touchdowns" and "Not Touchdowns."  In 17 trips to the Scoring Zone, Texas scored just 4 touchdowns.  I have no idea what average or good might look like for this stat, but I think we can all agree that this is terrible.

But why is this the case?  Where is the Scoring Zone offense failing?  Let’s go zone-by-zone.  Texas has only reached the Touchdown Zone before fourth down twice all year, both times on first down.  Once, Texas scored a touchdown (by Vondrell McGee vs. TCU) and once they turned it over on downs (by Jamaal Charles vs. ASU).    


Look, they can't all be winners, okay?
I'm tired.

The Yellow Zone and the Orange Zone are about even in their success scores, at .31 and .29 respectively, meaning that, at least thus far, there’s nothing inherently different about what Texas is doing offensively from the 20-11 yard lines (one half of the "traditional red zone") than what it is doing from the 30-21 yard lines (an area outside the "traditional red zone"), and neither of them is very good.  In fact, they’re downright bad.  My guess would be that anything above .8 would be acceptable, and Texas isn’t anywhere close to that.

A look at the Red Zone (yards 10-6), though, reveals levels of atrocity not even anticipated by the merely "bad" scores in the Yellow and Orange Zones.  So much so, even, that I think we need to look at these drives.  Against ASU, the only drive to include a snap in the Red Zone saw Jamaal Charles take a handoff at the 10 all the way to the end zone.  Texas’ only drive against TCU that included a snap in the Red Zone occurred when the offense has a second and 8 at the 10, followed by an incomplete pass and a Colt McCoy rush for 7 yards.  Although that run got Texas to the Touchdown Zone, it wasn’t until fourth down, which as I said earlier, isn’t a success at all.

On the first drive against UCF, Texas had a first and goal on the 7 and couldn’t even get the ball inside the 5 until fourth down.  On the second drive, Texas had a first and goal on the 8 and scored a touchdown in 2 plays.  Then on the third drive, Texas had a third and 2 on the 6 and Jamaal fumbled after appearing to pick up the first down.  So that’s 5 trips to the Red Zone, amounting to 2 touchdowns, 2 field goals, and a fumble.  It’s not a huge sample size, but it doesn’t look very good, and it appears that this is where the problem lies.

Thus the scoring percentage in this version of the Red Zone is 80%, which is all the box score gives you (albeit for their "larger red zone"), and which looks not too bad.  But that’s the danger of just looking at the box score.  You just can’t get the whole picture.  It misleads you into thinking that Texas might actually be doing well in the Red Zone and, even if you know better, it tells you nothing about where or why.

As I said, I’ll keep track of these red zone stats for the rest of the season and report back when there’s a better sample size.  In the meantime, I know this model isn’t perfect so any helpful suggestions on how to make it better would be appreciated.

--BZ--

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Bravo BZ

As an engineer who usually spends his free time drinking copious amounts of alcohol, I just wanted to say I'm impressed and interested in how this analysis goes for the rest of the season. I was hoping you hadn't accounted for success in converting/scoring and down, so I could leave a smart remark, but you are way ahead of me.

by rachorn06 on Sep 21, 2007 5:06 PM CDT   0 recs

i struggled with this

that's why it didn't get up until friday.  i'm still not convinced that this is the best way to do what i'm trying to do, but it's certainly something.

glad you liked it.  i see you're newly registered, so check out the previous columns if you haven't seen them yet.  click on the tag "playing the numbers game."

by billyzane on Sep 21, 2007 5:55 PM CDT to parent up   0 recs

MattH

or someone please do this for OU, then we could have a comparison of what has been a very effective offense this season to compare too.

by Wells on Sep 21, 2007 5:58 PM CDT   0 recs

bravo

This post got me to register too.

Fantastic stuff. I wonder how much work, I'm guessing quite a bit, it would be to take this a step further.

In order to get a good idea of how accurate your  given numbers are (the +/- scores and success rates) I think you to carry the analysis a bit further.

Gather data from other teams. First this will give you an idea of what the numbers for each zone mean. It'll also help you define what is good and was is not. With averages and what not you could better adjust the way you award success and failure points for the different zones.

Also comparing Scoring Zone rankings with the traditional Red Zone numbers might be useful somehow.

Also, also. On the flip side these numbers could be converted to calculaing Scoring Zone Defense ratings!!

This is very good and interesting stuff and I especially like how you incorporate the downs into how you rate an offenses success.

by jgunnip on Sep 21, 2007 6:15 PM CDT   0 recs

thank you

and you are very right, there is so much more i could do with this, but i just don't have the time to right now.  but that sounds like an excellent off-season project for me when i'm not writing a weekly column and could take a while to compile everything.

and now that you registered, stick around.  it's a great community.

by billyzane on Sep 21, 2007 7:06 PM CDT to parent up   0 recs

This is killer stuff

Thanks BZ

--PB--

by PB @ BON on Sep 21, 2007 6:15 PM CDT   0 recs

it's my pleasure

thanks for letting me write it.

by billyzane on Sep 21, 2007 7:07 PM CDT to parent up   0 recs

Expected Score

One way I think you could look at this is to compare the amount of points scored for the yard line achieved compared to the expected value. This article shows a chart for the NFL which shoes the expected score for the yard line and the down. I believe you should be able to extrapolate the equation of the trendlines to get a rough idea. Just due to the fact that college offenses score more I believe an effective offense should be doing well better than the expected value. While this chart does not take into effect the yardage needed for a first down, I believe this will even out over time.

by Vol Navy on Sep 21, 2007 8:29 PM CDT   0 recs

stupid football outsiders

i should just provide a link to an article of theirs every week instead of writing my own column....

by billyzane on Sep 21, 2007 11:29 PM CDT to parent up   0 recs

Excellent BZ

This is more up my alley. Your other posts have also been well-constructed, but my thinking has always been that numbers require nuance to make them useful, which in turn makes them very difficult to use as a productive indicator of strategy.

But this post is more about adapting the terms by which we both discuss strategy and determine our standards for success, and this, I believe, is a highly useful endeavor.

Coaches and analysts rarely break from conventions, and football strategy, as a result, becomes anchored by paradigms. I remember reading a book a few years back ("wisdom of crowds," maybe???) in which a system was discussed that applied point values to field position as a way to determine the efficiency of going for 4th down conversions. The numbers showed that coaches should actually be going for 4th downs FAR more often than they do. What holds them back? Probably a little bit of fear, but more likely its just conventional logic. The coaches they had learned from saw 4th down as a kicking down, so do all of the other current coaches, and so they just assume that 4th down is a kicking down. But the numbers behind this particular system's logic suggested otherwise.

The logic was something to the effect that if you look at a 4th down conversion as one play, then you make it or you don't, and then your success or failure is judged on this small sample. But multiple things happen if you look at the bigger picture. First, if you make, for example,  50% of your 4th and 1 situations [let's say in your opponents territory] over a larger sample, you are statistically likely to score a lot more points, even if you "failed" on a lot of the individual plays. Second, and less numerically, you acclimate the players to viewing 4th down as "just another down," meaning that you remove a lot of the psychological tensions and pressures that we currently associate with 4th down [your players aren't as nervous, and more importantly, the defense and the opposing crowd isn't as jacked up], these are tensions that exist simply because a conversion attempt is still very rare. In other words, we choose to make a 4th down conversion a big play by saving it for only the most dramatic occasions. Perhaps offenses would have even more success if this were not the case.

Anyway, I'm rambling. My point is that I find this type of analysis extremely important, because it doesn't simply lock onto the numbers and attempt to find some abstract statistical advantage or learning tool, rather it attempts to SEE the game differently, and this is the stuff of which strategic break-through's are made.  

Your column here qualifies. The redzone is not only an arbitrary demarcation we use to divide statistics, but it is also a paradigm from which coaches, players and fans extract a lot of significance [or in our case angst]. But paradigms and numbers both mislead, and it isn't so much that we need to group the numbers differently or more selectively, rather we need to find a new angle to incorporate the numbers into the way we're looking at the game so we can more usefully integrate the numbers with human-nuance and strategy.

This is a pretty good first step. Good stuff.

by BrooklynHorn on Sep 21, 2007 8:49 PM CDT   0 recs

I feel you

that's sort of what i wanted this to be from the beginning.  I thought about doing something about 4th downs, but I figured it had been done to death by people much more qualified than I.

With the other columns, I tried to do something like what you're talking about (i.e. dispelling the notion that rushing for more yards than your opponent wins games and arguing that traditional notions of how we measure rushing efficiency are inherently flawed).  But I think I've been constraining myself by the "numbers" aspect of the column.  But I'll definitely think about going a bit more abstract in the future.  I like it more also, I think.

And thanks for the kind words.

by billyzane on Sep 21, 2007 11:12 PM CDT to parent up   0 recs

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