in Football

Recruiting rankings vs. overall success

Photo Attribution: US Presswire

Photo Attribution: US Presswire

I can’t think of two things college football fans argue more about than recruiting rankings and end-of-season team rankings. Sounds like a good starting point for a post.

This one is right up the @osustats alley. Here’s the data we started with:

Team Rankings: we used F/+ for this because it goes far beyond the top 20…the joint system of Brian Fremeau and Bill Connelly ranks programs 1-120. We’ve covered this system before.

Recruiting Rankings: we used the Rivals recruiting rankings. Yes, others are available but these are probably as good or better than any recruiting rankings out there.

We compared the average of the four recruiting classes leading up to a season against the end-of-season F/+ ranking for each team. Let’s look at OSU’s 2012 season as an example. For the season that just ended, here are the four recruiting classes we looked at:

So, the four recruiting classes that contributed to the talent on the field for OSU’s 2012 season had an average ranking of 32. If recruiting rankings were all that mattered, OSU should have a final F/+ ranking of somewhere around 32, right? Well, we finished the season ranked at #12 in the F/+ system. In other words, we overachieved by 20 spots.

Now, is this perfect? No. Is there a perfect way to do this? No, but please feel free to write in the comments how you would have done it differently.

First, let’s take a look at a scatter plot of all teams from 2008 to current and how recruiting rankings correlate to final F/+ rankings:

Okay, let’s break this down. Each of those 590 dots represents a college football team from 2008 to 2012 (five seasons). They are plotted on the graph this way: the average of the last four Rivals recruiting rankings is on the X-axis and the final F/+ ranking is on the Y-axis. You want to be up at the top right, where your team’s recruiting ranking is high and your F/+ ranking is high.

The trendline running through the data is the closest fit to each dot. The coefficient of determination is .42, meaning that based on this data, recruiting “explains” 42% of a team’s final rankings. Now, you could certainly argue with that figure. You could say we shouldn’t use a simple average of the team’s last four classes. You could say we shouldn’t use Rivals or F/+. There are all kinds of ways to attack this, and we recognize that. This is more a conversation starter than a conversation ender, so let’s just have fun with it.

Think about this…recruiting is just one variable that goes into a team’s success. It might be the single most important variable, but throw in coaching, player development, character, injuries, transfers in & out, class, and girlfriends, and it’s no wonder that recruiting only accounts for 42% of a team’s success.

All of that said, let’s get back to the chart. I said before that you want to be at the top right. But once a recruiting class is complete, you can’t change where you are on the X-axis. All you can do is develop and coach your players to the top of the Y-axis. So once signing day comes and goes, you want to get your team above the trendline that runs through the chart…you want to overachieve your recruiting ranking.

Mike Gundy and OSU have managed to do that in 4 out of the last 5 seasons:
In 2008, we were better than our recruiting classes by 7 spots. In 2009, we finished up 10 spots lower (mostly due to Zac & Kendall getting hurt and Dez getting suspended). But in each of the last three years, OSU has overachieved our recruiting classes by 19 or more spots per year. In 2011, Rivals said our talent level was around 30th-best in the country. We finished 3rd.

As Gundy said, “We take a two-star and make him a three, a three and make him a four and a four and make him a five. We really believe that’s what we do.”

The orange spots on the chart are OSU’s five seasons from 2008 to 2012. All are close to or above the trendline, which is where you want to be as a coaching staff.

Enough about us. Let’s take a look at the other teams in the Big 12. Teams are listed in order of overachievers to underachievers. OSU would be second in this list but you’ve already seen our figures.

Poor Kansas. They even lost to Texas in underachieving.

A few thoughts here. TCU has steadily climbed in recruiting rankings over the last five years. They can’t continue to overachieve their classes to the extent that have in the past, but clearly they know what they are doing down there.

West Virginia’s figures look very similar to ours with the exception of what turned out to be a miserable 2012 season for them.

How about Snyder taking top 70 level talent to a 5th-place F/+ finish.

For all of the bellyaching in Norman, Stoops has performed about as well as he’s been recruiting — which is very well. He almost always turns in a top 10 class and a top 10 finish. Most anyone would be happy with that.

Skipping down to Texas, they really haven’t been horrible over the last two seasons, it’s just that with the pick of the litter in Texas and elite recruiting classes every year, you need to be in the top 10 at the end of the year on a consistent basis.

Kansas: the only thing I’m puzzled by is Kansas getting top 50 classes.

Nationally, here are the BCS programs that overachieved in all five seasons in this study (I am not including the Big East in this group): just TCU and Oregon. Boise State and Tulsa also achieved this feat.

OSU and West Virginia are in the 4 out of 5 club, along with Wisconsin, Stanford, Iowa, Oregon State, and Michigan State.

How about the schools that underachieved all five years? Florida State, Duke, USC, Arizona State, Cal, Virginia, Washington State, Tennessee, Washington, UCLA, and Colorado are in this club.

The Top 10 overachievers are:
1) Boise – overachieved by 64 spots
2) Navy – 51
3) TCU – 49
4) Northern Illinois – 47
5) Air Force – 42
6) Cincinnati – 41
7) Nevada – 36
8) Connecticut – 31
9) Wisconsin – 29
9) Bowling Green – 29

OSU is 30th in this list at 13 spots.

The Top 10 underachievers are:
10) Virginia – underachieved by 30 spots
9) Washington State – 31
8) Minnesota – 33
7) Tennessee – 34
6) Washington – 35
5) Auburn – 36 (and this includes a national championship!)
4) Maryland – 37
3) Kansas – 43
2) UCLA – 45
1) Colorado – 54

  • http://twitter.com/Sugar_Skull_PP Sugar Skull P.P. (@Sugar_Skull_PP)

    I surrender to your maths, sir.

  • Kyle

    Very interesting! Thanks for sharing!

  • Jheri Curl

    Recruiting rankings and classes by Scout, Rivals, etc is highly political. E.g. if a kid is getting interest from a Notre Dame, Texas or Bama he will likely get bumped up a star, happens all the time.

    But really what Gundy said before is true, they turn 2-stars into threes, 3-stars in fours, and so forth. A lot of it is determined by how hungry a kid is because he has to get into the weight room, film room, practice field, etc to become better every day. Ok State is doing a very good job thanks to Rob Glass & co, the chefs at the dining room, trainers, coaches, et al.

  • Poke

    You said a team wants to be in the top right. What you really mean is above the1:1 line as it would indicate “over-achieving”. All the trend line says, as you pointed out, that roughly 40% of a team’s season rank is attributable to recruiting rank. Btw, your response variable (season ranking) should always be on the X axis.

    • http://gravatar.com/okcdave okcdave

      Well yes, but I for one always want a highly-ranked recruiting class AND a high end-of-season rank so I would prefer to be at the top right. That’s where Bama, LSU, OU, Oregon, etc. are. We are performing at a high level but it would be nice to recruit on that level as well.

      Thanks for the feedback on the axis. I am not a statistician, I just pretend to be one.

      • Poke

        Good job. It was fun looking at the plots and tables.

      • Poke

        Mispoke… You got x y correct, the origin in upper right was messing with me.

  • austinpoke

    Awesome………..this is the best synopsis I’ve ever seen of recruiting and recruiting results. If I’m a TCU fan, I don’t want this data getting out…………..Patterson will have even more ADs after him once they read this.

  • G-Block

    I liked this article; well done. I’ve suspected that teams’ floors are only as low as the recruiting class. Nice to see me proved wrong here. I’m looking forward to what tweaks our two coordinators will bring to the field this year with this year’s players.

    Just a thought: I’m still not sold on the TCU bandwagon. I’m still not a believer that playing in the Mountain West/ WAC and playing one or two BCS teams a year was enough to warrant their excellent final ranking via the BCS poll from 2008 – 2011. But that changed last year now that they’re in the Big 12, and the only BCS school sitting in the heart of DFW, and with new facilities coming….

  • http://gravatar.com/jbob1011 Jamie

    Very well done. Retweeted from @FrogsOWar.

    As for TCU’s ranking, this coaching staff (especially the defense) has a knack for taking under recruited guys and turning them into studs. Take Jerry Hughes and Stansly Maponga as examples.

    Also, if we can stinking stay healthy this year, we may actually be worth something.

  • Glen

    I’d love to see this analysis built upon each season. Worth it’s weight in salt as fodder for the canon goes. There are (insert college here) fans all over the country who love to blow hard about how great they are Going to be based on preseason numbers of all kinds. They should all have their numbers crunched in such a manner then fired back at them. Well done as always.

  • FredA

    Correlation coefficient equals zero.

  • Michael

    This was an excellent post. I read PFB all the time and this is the first post to inspire my comment. Very thought-provoking.

  • OSUaggie

    Nice piece of work Dave; we’ve known for a couple of years now that Gundy & Co. appear pretty dang good at creating over-achievers, never hurts to get a little math behind the picture though…..

  • Mark

    As you stated, there are plenty of possible arguments against the numbers, but I for one think that ‘42% of end result attributed to recruiting rankings’ is probably a pretty accurate assessment.

    How ’bout them Longhorns? LOL