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You down with YPP? A New Football Efficiency Statistic

Bad titles aside,

In the coming weeks I'll be statistically reviewing the 2008 Big Ten Football season from a statistical point of view.  This means looking at traditional stats (turnovers, yardage, etc.) along with untraditional ones.  The stat I'll be looking with falls into that untraditional category.  This week, I'll be looking at yards per point (YPP).

Yards per point is a stat devised by Phil Steele six years ago as an offensive efficiency stat.  It's easy enough to understand:  Take a team's total yardage for the season and divide it by the amount of points scored during that same season, and what's left is YPP.

What does it mean though?  Well, a team with lower yards per point is more efficient.  Those teams typically have better red zone scoring percentages, field goal percentages, and commit less turnovers.  The inverse is also true - teams with higher yards per point typically have lower red zone scoring and field goal percentage, and turn the ball over repeatedly.  Think of it as a kind of luck factor - teams with a low YPP might have gotten luckier than teams with a high YPP.  After the jump, you'll see the YPP for the Big Ten.  Note - YPP for all BCS conference teams and Notre Dame (NBC will sue us if we don't include them) can be found in a FanPost on the right side of the front page.

Star-divide

 

TeamYards Per PointRed Zone %FG %Turnovers4th down %Wins
Penn State 11.54 92.4 84 7 38.5 11
Iowa 12.22 84.2 79.2 8 50 9
Ohio State 12.42 95.1 81.5 16 44.4 10
Michigan State 13.69 84.9 78.6 2 60 9
Minnesota 13.92 87.8 75 12 60 7
Michigan 14.4 77.1 66.7 -10 70 3
Wisconsin 14.52 84.9 83.3 -8 63.6 7
Northwestern 14.69 85.2 80 -3 28.6 9
Purdue 15.16 82.9 61.9 -3 51.7 4
Illinois 15.29 82.1 75 -6 33.3 5
Indiana 16.99 66.7 58.8 1 26.1 3

 

First, a few notes about why I chose to display other stats along with YPP.  Turnovers and 4th down percentage are pretty obvious; a team will have a hard time scoring if they can't hold onto the ball.  I included red zone percentage because that's another efficency stat along with YPP, and I included FG percentage because if a team has a good field goal kicker, they're going to get three points out of a drivethat goes to the opponent's more times than a team with a mediocre one.  I'm sure other statistics have an effect as well, but I feel these are the most important ones.

As you can see, YPP correlates somewhat with performance.  Four of the top five teams in the Big Ten last year ranked in the top five in terms of YPP, with Northwestern being the anomaly. YPP and a lot of other statistics are like puzzle pieces in that respect - look at just one piece and you have no clue what's going on, but as you start putting pieces together, the picture begins to come into view. 

As for what this means for the Big Ten in 2009?  I'd look for Michigan to improve offensively.  It's a wonder their YPP was 6th in the Big Ten with 10 more turnovers than their opponents and their sub-par red zone and field goal percentages.  With a few breaks, their offense should be more efficent this year.  Illinois is another team poised to make an improvement.  The Illini had good red zone and field goal percentages, and a few more breaks with turnovers will mean that they'll be able to improve upon their five wins in 2008.

Conversely, I'm predicting Minnesota to drop off a bit production-wise.  It's clear that a few of their wins early in the 2008 season hinged on turnovers - turnovers they might not get this year.  The same goes for Ohio State as well.  They had the best red zone percentage and turnover stats in the Big Ten, and it'll be hard for OSU (note: I will never use the acronym tOSU, besides now.  The word "the" is just an article, get over it) to be as efficient as last year.  Still, their drop off won't be nearly as painful as Minnesota's.

What have we learned today?  YPP can tell us how efficient a team's offense was in previous seasons.  It also can be used to some degree to determine the luck of a particular team in a season.  Mostly though, we learned that I have way too much time on my hands.  Now if you'll excuse me, I have to go and continue to be frightened of girls.

1 recs  |  Comment 9 comments |

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Nifty stat

I am overwhelmed with the urge to construct a yards-vs.-points scatterplot.

Cheer for The Only Colors: Green and White!

by KJ@theonlycolors on Jun 12, 2009 1:30 PM CDT reply actions   0 recs

This stat probably also tells you a lot

About your defense and special teams. If your D is good you get to start with a shorter field either because they forced a turnover or limited your opponent to a three and out. A strong return game could also shorten the field, resulting in fewer yards per point.

by TheCrestedHelm on Jun 12, 2009 1:54 PM CDT reply actions   0 recs

Whew

This fills my offseason need for more PORPAG.

by Ozymandias on Jun 13, 2009 10:15 AM CDT reply actions   0 recs

So as far as luck goes...

Does this mean that Northwestern and Wisconsin were lucky to get as many wins as they did, as the rest of the trend would seem to indicate they are outliers?

Light a man a fire, he'll stay warm for a day.
Light a man afire, he'll be warm for the rest of his life.

by Seer on Jun 13, 2009 10:48 PM CDT reply actions   0 recs

I think it’s actually the other way around.

If MSU, for example, isn’t as efficient in turning yards into points this year (by avoiding turnovers, etc.), they won’t score as many points and may not win as many games.

Wisconin and NW, meanwhile, would appear to have the offensive ability to generate yards and may just need a little more luck in terms of turning those yards into points.

In any event, I think you have to look at the stat as a big-picture indicator and delve into the details if you really want to a tell a story about a team being lucky/unlucky.

Cheer for The Only Colors: Green and White!

by KJ@theonlycolors on Jun 15, 2009 8:56 AM CDT up reply actions   0 recs

Yeah!!!!! (Howard Dean voice)

“(note: I will never use the acronym tOSU, besides now. The word “the” is just an article, get over it)"

You tell ‘em Pete. Next, let’s get to work on announcers that can’t tell the difference between an end around and a reverse. I wouldn’t be surprised to see that play return to popularity in 2009 for MSU, with Keyshawn Martin getting the ball the way Devin Thomas did in 2007.

by witless chum on Jun 15, 2009 8:27 AM CDT reply actions   0 recs

YPP Differential

I like this stat a lot, particularly because it takes into account total team performance.

Something I’ve done a lot of research into (but have been too lazy to write up) is yards per point differential. It involves the YPP you have here (for shorthand, I call it offensive YPP even though that doesn’t tell the whole story), and also yards per point allowed (yds allowed/pts allowed) which I call defensive YPP. Unlike offensive YPP, you want your defensive YPP to be as large a number as possible.

The next step is simply to subtract offensive YPP from defensive YPP. The remaining number is just a number in and of itself, but when compared to everyone else’s, it is useful. It tells you the combination of how hard you made things on other teams combined with how easy you made things on yourself. Team efficiency, in other words.

Last year, Boise State had the highest differential at 12.71, but USC was right behind in the No. 2 spot at 12.53. Florida was third at 11.87, but the Gators’ BCSCG opponent Oklahoma was only 14th at 4.30. Since 2001 the team with the higher differential is 23-12 in BCS games, and there’s never bee more than two losses, so it’s a fairly good predictor of who will win.

The highest differential of the decade belongs to 2001 Miami, and it’s not even close. That team had a differential of 18.40 (def: 28.93, off: 10.53), with last year’s Boise St. and USC taking spots 2 and 3 (‘02 Ohio State was fourth). That Miami team had the highest defensive YPP of the decade, with 2002 Kansas State having the lowest offensive YPP of the decade at 9.45 (’02 Cal is second at 9.99, the only other team below 10). The lowest differential of the decade? 2005 Buffalo at -15.63.

The next step would be to do YPP without games against I-AA teams, but it would take forever to remove those outcomes from the stats.

Team Speed Kills
SBNation's SEC Blog

by Year2 on Jun 16, 2009 10:01 AM CDT reply actions   0 recs

Nice idea

Taking out 1-AA teams would take forever, but that designation can also seem arbitrary in a way when you consider that some 1-AA would beat some D1 teams (Florida International, for example).

I think another step would be some sort of multiplier that took into account strength of schedule. Boise throwing up that kind of number is impressive, but my instincts lead me to believe USC’s differential might be more so.

Co-Manager: The Only Colors

by Pete Rossman on Jun 16, 2009 5:00 PM CDT up reply actions   0 recs

Absolutely; the WAC is mostly a joke and has been surpassed in every way by the MWC (which wasn’t the case even two years ago). There’s much more to be done with it.

The magnitude by which that ’01 Miami team is ahead of everyone else is just a bit shocking to me. It makes me want to go back in time to look at some of the other all-time great teams to see how they ended up.

Team Speed Kills
SBNation's SEC Blog

by Year2 on Jun 16, 2009 8:34 PM CDT up reply actions   0 recs

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