The RPI vs. Ken Pomeroy: A Look At Which Likely Tournament Teams Are Valued Most Differently
The last few years, I have taken a look at which teams were valued most differently by the RPI (Ratings Percentage Index) and by Ken Pomeroy’s rankings near the start of February, to see how those teams performed thereafter. Here is last year, where I looked at the five teams valued most differently for each. Now, I don’t think we really care if the RPI ranks a school #150 and Pomeroy has them ranked #200. So I limited my look to teams likely to be in the tournament, ranked in the top 30 in either the RPI or Pomeroy’s rankings (or both).
Why does this matter? Well, last year, all ten teams I highlighted made the NCAA tournament. The RPI darlings bombed out to an 0-5 record, even though three of the five still finished as a 6 seed or higher thanks to their RPI. Sure, it took a massive upset like Duke losing as a 2-seed to keep them winless, but still, not a good performance for the teams who were rated much higher in the RPI.
The Pomeroy favored-teams, on the other hand, generally played to seed, finishing 5-5 despite having a worse average seed than the RPI darlings. Indiana and Wisconsin advanced the farthest, both losing in the Sweet Sixteen to #1 seeds.
We’ll expand it out to ten teams each this year. Here are the ten RPI darlings, who are rated at least 11 spots higher in the RPI than Pomeroy.
Here are the ten teams where Pomeroy has rated higher than the RPI, among his top 30.
The Miami Hurricanes are a legitimate top contender. I’m not sure they are the second best team in the country, but they are the only one on that RPI list that shows up inside the top 30 of Pomeroy’s rankings. Wisconsin has long been a source of controversy in Pomeroy’s rankings (though to be fair, they did rise to a 4-seed last year). So has Belmont, though, and the Bruins have now managed to flip sides where the Pomeroy rankings do not think as highly as RPI. San Diego State also flipped this year, showing that in the world of rankings, there are no favorites. It’s just recording what happens.
Last year, I took Seth Davis to task for asking why we would prefer efficient losers to inefficient winners. Then, I pointed out that there wasn’t much difference between the records of the two groups. So guess which group has the higher winning percentage this year, the RPI, which only looks at wins and losses, or the teams ranked much higher by Pomeroy?
The Ten Pomeroy Teams: 167-51 (76.6%)
The Ten RPI Teams: 162-50 (76.4%)
Virtually indistinguishable by record, with, yes, the efficient losers winning slightly more. The difference is just how you look at performance, but it is a myth that teams ranked highly in Pomeroy relative to RPI do not win games.
To compare both to another outside group (not that I think rankings are good, but it’s just something different to compare to), the RPI teams do have a better record against teams currently ranked in either the AP or Coaches Poll. It’s 13-22 for the RPI teams (37%) and 9-23 (28%) for the Pomeroy teams. It’s not like the RPI Stars are dominating against great competition, though. They are -6.4 per game in point differential, compared to -2.1 in ranked games for the Pomeroy teams. The RPI teams have won close games decided in the final seconds, and gotten blown out. You could switch a couple of plays and the outcomes here would be different.
So, as we head toward another March, we can again see if the inefficient losers outperform. Personally, I don’t think 19-3 New Mexico coached by Steve Alford is as good as his alma mater, 20-2 Indiana, but remember, that’s what the NCAA’s #1 tool for evaluating teams is currently saying.
Because it values winners.
[photo via USA Today Sports Images]

- The 2016 Super Bowl Has Been Awarded to the Bay Area, at the New Levi’s Stadium [UPDATE: Houston Will Host in 2017]
- Red Wings Players Hit Each Other In the Nuts Before Blackhawks Game
- The NBA Draft Lottery: Winner Gets Nerlens Noel? Or Ben McLemore?
- Guy Puts Girlfriend in Triangle Choke (to Propose During Brazilian Jiu-Jitsu Class) [Video]
- DeAndre Jordan Posterized an “Unsuspecting” Charissa Thompson on SportsNation [Video]

- Watsonian on The NBA Draft Lottery: Winner Gets Nerlens Noel? Or Ben McLemore?
- scripty on Red Wings Players Hit Each Other In the Nuts Before Blackhawks Game
- Jason Lisk on The 2016 Super Bowl Has Been Awarded to the Bay Area, at the New Levi's Stadium [UPDATE: Houston Will Host in 2017]
- Scalia on The NBA Draft Lottery: Winner Gets Nerlens Noel? Or Ben McLemore?
- PurdueMatt on The NBA Draft Lottery: Winner Gets Nerlens Noel? Or Ben McLemore?
12 Responses to “The RPI vs. Ken Pomeroy: A Look At Which Likely Tournament Teams Are Valued Most Differently”
Leave a Reply
You must be logged in to post a comment.









February 5th, 2013 at 4:07 PM
The last few years, I have taken a look at which teams were valued most differently by the RPI (Ratings Percentage Index) and by Ken Pomeroy’s rankings near the start of February, to see how those teams performed thereafter.
What ever happened to the final results of the college football thing you set up?
February 5th, 2013 at 4:08 PM
I thought the Texas AD clarified that nobody cares about college hoops this year. What he said was a broad generalizable fact right?
February 5th, 2013 at 4:14 PM
I thought the Texas AD clarified that nobody cares about college hoops this year. What he said was a broad generalizable fact right?
He meant Texas hoops.
February 5th, 2013 at 4:15 PM
fixed
/ by Darrell
// pretty sure i fucked up those tags
February 5th, 2013 at 4:19 PM
Last year Pomeroy wrote a piece about how his system pretty much is a success except for him not being able to get it to stop overrating Wisconsin, funny to see them ranked that highly again
February 5th, 2013 at 4:24 PM
we all fell for that, man. Lisk straight up took our money.
February 5th, 2013 at 4:26 PM
My underdog darkhorse this season is Stephen F. Austin (if they win out in the Southland, obviously). Not much height, but beat Oklahoma and Tulsa on the road. Think they pull a first-round upset as a 15-16 seed.
February 5th, 2013 at 4:27 PM
That shit happens when you lose to this year’s WVU team.
February 5th, 2013 at 4:27 PM
Colorado is 25 in the RPI? That is a misprint, please tell me that is a misprint. They are 4-5 in PAC 10 play! It has been an ugly 4-5 too. They eyeball test says triple digits.
February 5th, 2013 at 4:33 PM
we all fell for that, man. Lisk straight up took our money. Mizerle
Last time I send money to a guy I met on the internet.
February 5th, 2013 at 4:58 PM
My understanding is the problem is that Wisconsin is always extremely efficient when it beats up on bad teams, more so than most, and that ends up skewing the data just a bit. But in the end, Wisconsin hasn’t been THAT overrated by the system, only a little. They’ve been very good on the court as well as in Pomeroy’s ratings.
This year will be interesting, though.
February 5th, 2013 at 5:04 PM
They are an intriguing team, but winning at Tulsa isn’t impressive. Tulsa stinks this year. I don’t see them being competitive vs. a 1 or 2 seed.