Following are frequently asked questions about the RPI. Click the title of the question to see the response.
The Rating Percentage Index is a statistical system used to comparatively rank teams. This transparent system allows anyone to calculate the formula. The RPI will be used to both award at-large berths and to seed teams for the 3A/4A Basketball & Soccer State Championships.
The formula is: RPI = (30% x MWP) + (40% x OWP) + (30% x OOWP)
• MWP (Modified Winning Percentage): The teams winning percentage versus all other varsity teams (3A & 4A Basketball, DI & DII Soccer). To calculate: Divide the number of games won (against varsity level teams only) by total number games played (against varsity level teams).
• OWP (Opponents Winning Percentage): Average of the MWP of a team’s opponents. *
(Note: The OWP is not calculated via the combined record of the opponents, but rather by averaging the winning percentage of the opponents).
• OOWP (Opponents’ Opponents Winning Percentage: Same process as OWP except the calculation is with the opponents of the team’s opponent.*
* when calculating OWP and OOWP, the head-to-head matchup between teams is taken out of the equation.
All 3A & 4A varsity basketball games & DI and DII soccer matches against all other in those same categories are used in the RPI. Games which are NOT included in the RPI are results against over classifications, sub-varsity, and out-of-state teams. For example: If a 3A varsity team plays a 4A JV team, that result would not factor into the RPI.
There are several advantages to using the RPI. Because the rankings can be seen during the regular season, schools will have better sense of their chances for a higher seed or an at-large selection sooner in the process. This will also help ensure all games are correctly entered throughout the season. Additionally, the RPI has the third layer, OOWP, which the previous WPI system did not calculate.
The official ASAA RPI standings will be updated every hour on ASAA365.com. This update will occur on the half-hour. It is worth noting that any RPI data published elsewhere is unofficial and could be incorrect.
School teams should be inputting their schedule and scores into MaxPreps. The official RPI feed will be calculated based on the results entered into MaxPreps by the school coaching/admin staff. Contact ASAA for assistance on entering scores.
The RPI is based on a win-loss records. Score differential will have no bearing on the RPI.
The RPI formula works off the averages of three components: modified winning percentage, opponents’ winning percentage and opponents’ opponents winning percentage, so an imbalance of games between two teams will have virtually no impact on the ranking system.
The final RPI calculations used for at-large and seeding purposes will be based on the final records of all teams. This will include games played during the conference tournament.
OWP is the average winning percentages of a team’s opponents. (Note: This is not calculated via the combined record of the opponents, but rather averaging each winning percentage of the opponents.) It is also important to remember that when calculating OWP (and OOWP), the head-to-head matchup between teams is taken out of the equation. That game already is figured in both teams’ WP. The rationale for omitting this result is so there is not a double increase or a double decrease for a specific game. Doing so gives an accurate assessment of how teams rate when they are not playing each other.
Yes, all games played thru the conference championship tournaments will be included.
Yes, all games, including endowments are included in the RPI.
The at-large selection and seeding will be solely based on the final RPI results.
Rank = RPI rank of the School Team RPI = Ranking Percentage Index School = School Team MWP = Modified Winning Percentage (record of team versus eligible varsity 3A & 4A games only) OWP = Opponents Winning Percentage OOWP = Opponents Opponents Winning Percentage WL = Overall win loss record against all teams (includes 1A, 2A, 3A, 4A schools but does not include non ASAA member schools)
The formula is: RPI = (30% x MWP) + (40% x OWP) + (30% x OOWP) Rank = RPI rank of the School Team RPI = Ranking Percentage Index School = School Team MWP = Modified Winning Percentage (record of team versus eligible varsity DI & DII games only) OWP = Opponents Winning Percentage OOWP = Opponents Opponents Winning Percentage WL = Overall win loss record against all teams (includes DI & DII schools but does not include non ASAA member schools)
