Basketball RPI

[talktomewillis]

A loss is a loss, as far as the RPI is concerned. There is no location differential. Now, there is a difference in how it is perceived, but that does not affect the RPI.

This is incorrect.

For the team that's playing, location means a lot. For RPI purposes, a home win is worth .6 of a win, while a road win is worth 1.3. Conversely a road loss counts as .6 of a loss, but a home loss counts 1.3.

It's been that way for about four years now.

[CajunAmos]

This is incorrect.

For the team that's playing, location means a lot. For RPI purposes, a home win is worth .6 of a win, while a road win is worth 1.3. Conversely a road loss counts as .6 of a loss, but a home loss counts 1.3.

It's been that way for about four years now.

I thought the home/road RPI adjustments were in baseball only. I've never seen anything showing that for basketball.

[talktomewillis]

Actually, I believe baseball is the one that copied basketball.

[VObserver]

I thought the home/road RPI adjustments were in baseball only. I've never seen anything showing that for basketball.

This is correct. No home/road adjustments for basketball

[CajunAmos]

Actually, I believe baseball is the one that copied basketball.

Thanks. I actually looked it up and found this description on Wikipedia which I assume is correct.

https://en.wikipedia.org/wiki/Rating_percentage_index

Basketball formula

The current and commonly used formula for determining the RPI of a college basketball team at any given time is as follows.

RPI = (WP * 0.25) + (OWP * 0.50) + (OOWP * 0.25)

where WP is Winning Percentage, OWP is Opponents' Winning Percentage and OOWP is Opponents' Opponents' Winning Percentage.

The WP is calculated by taking a team's wins divided by the number of games it has played (i.e. wins plus losses).

For Division 1 NCAA Men's basketball, the WP factor of the RPI was updated in 2004 to account for differences in home, away, and neutral games. A home win now counts as 0.6 win, while a road win counts as 1.4 wins. Inversely, a home loss equals 1.4 losses, while a road loss counts as 0.6 loss. A neutral game counts as 1 win or 1 loss. This change was based on statistical data that consistently showed home teams in Division I basketball winning about two-thirds of the time.[3] Note that this location adjustment applies only to the WP factor and not the OWP and OOWP factors. Only games against Division 1 teams are included for all RPI factors. As an example, if a team loses to Syracuse at home, beats them away, and then loses to Cincinnati away, their record would be 1–2. Considering the weighted aspect of the WP, their winning percentage is 1.4 / (1.4 + 1.4 + 0.6) = 0.4117

The OWP is calculated by taking the average of the WP's for each of the team's opponents with the requirement that all games against the team in question are removed from the calculation. Continuing from the example above, assume Syracuse has played one other game and lost, while Cincinnati has played two other teams and won. The team in question has played Syracuse twice and therefore Syracuse must be counted twice. Thus the OWP of the team is (0/1 + 0/1 + 2/2) / 3 (number of opponents – Syracuse, Syracuse, Cincinnati). OWP = 0.3333

The OOWP is calculated by taking the average of each Opponent's OWP. Note that the team in question is part of the team's OOWP. In fact, the most re-occurring opponent of your opponents is the team in question.

The RPI formula also has many flaws. Due to the heavy weighting of opponents winning percentage, beating a team with a bad RPI may actually hurt your RPI. In addition, losing to a good RPI team can help your RPI.

[VObserver]

This is correct. No home/road adjustments for basketball

I stand corrected

[talktomewillis]

Thanks. I actually looked it up and found this description on Wikipedia which I assume is correct.

https://en.wikipedia.org/wiki/Rating_percentage_index

Basketball formula

The current and commonly used formula for determining the RPI of a college basketball team at any given time is as follows.

RPI = (WP * 0.25) + (OWP * 0.50) + (OOWP * 0.25)

where WP is Winning Percentage, OWP is Opponents' Winning Percentage and OOWP is Opponents' Opponents' Winning Percentage.

The WP is calculated by taking a team's wins divided by the number of games it has played (i.e. wins plus losses).

For Division 1 NCAA Men's basketball, the WP factor of the RPI was updated in 2004 to account for differences in home, away, and neutral games. A home win now counts as 0.6 win, while a road win counts as 1.4 wins. Inversely, a home loss equals 1.4 losses, while a road loss counts as 0.6 loss. A neutral game counts as 1 win or 1 loss. This change was based on statistical data that consistently showed home teams in Division I basketball winning about two-thirds of the time.[3] Note that this location adjustment applies only to the WP factor and not the OWP and OOWP factors. Only games against Division 1 teams are included for all RPI factors. As an example, if a team loses to Syracuse at home, beats them away, and then loses to Cincinnati away, their record would be 1–2. Considering the weighted aspect of the WP, their winning percentage is 1.4 / (1.4 + 1.4 + 0.6) = 0.4117

The OWP is calculated by taking the average of the WP's for each of the team's opponents with the requirement that all games against the team in question are removed from the calculation. Continuing from the example above, assume Syracuse has played one other game and lost, while Cincinnati has played two other teams and won. The team in question has played Syracuse twice and therefore Syracuse must be counted twice. Thus the OWP of the team is (0/1 + 0/1 + 2/2) / 3 (number of opponents – Syracuse, Syracuse, Cincinnati). OWP = 0.3333

The OOWP is calculated by taking the average of each Opponent's OWP. Note that the team in question is part of the team's OOWP. In fact, the most re-occurring opponent of your opponents is the team in question.

The RPI formula also has many flaws. Due to the heavy weighting of opponents winning percentage, beating a team with a bad RPI may actually hurt your RPI. In addition, losing to a good RPI team can help your RPI.

Thanks for the clarification, Amos.

[jumboragncajun]

So does Marlin have more top 25 votes than HUD ever got? If so, dam, who'duh thunk that 3 years ago?

[CajunEXPRESS]

I stand corrected

We should probably play more road games against top 100 teams. A win is a three run homer. Road win, top 100 win, & a pay check.

[Cajunsmike]

We should probably play more road games against top 100 teams. A win is a three run homer. Road win, top 100 win, & a pay check.

Not sure specifically about next year, but I believe that is the general plan going forward regarding scheduling. On the other hand, RPI is being deemphasized therefore this may not be as much of a factor in the future.

[CajunEXPRESS]

SOS & RPI are closely connected. Committee also highly values wins vs better competition and discounts losses to same. You've got to win some. That's why our at large hopes are just that hopes. Strangely if we win the final game we probably jump a P5 team or two in seeding.

[DieHard1280]

This team isn't letting anyone derail them the Big Dance. I think they will slip up once before the tourney but they won't lose again until the Sweet 16. That's my story and I'm sticking to it.