Basketball Ncaa Rpi
In men’s college basketball, the NCAA uses RPI and SOS ratings. What are they and what are the formulas?
RPI and SOS ratings are used in men’s college baskeball. Please explain what they are and what is the formula the NCAA uses for figuring out each of them?
Commonly known as RPI, the Ratings Percentage Index is one of the rating systems whereby NCAA basketball teams are ranked. This system has been in use since 1981 to aid in selecting and seeding of the teams appearing in the 65-team men’s playoffs (see also, March Madness). It has also been used to aid in the selection and seeding process for the 64-team women’s tournament since its inception in 1982. The Index comprises that team’s winning percentage (25%), its opponents’ winning percentage (50%), and the winning percentage of those opponents’ opponents (25%).
Some feel that this heavy emphasis upon strength of schedule unfairly advantages teams from major conferences. Teams from “majors” are allowed to pick many of their scheduled non-conference opponents (often, blatantly weaker teams); but, teams from “low-major” conferences may only get one, if any, such chosen-opponent “slot” on their schedules. On the other hand, some “mid-major” conferences compel their member-teams to regularly schedule opponents ranked in the top half of the RPI, which could eventually boost the strength of that conference and/or its tougher-scheduling teams. The Missouri Valley Conference has successfully done this: It has become one of the top-rated RPI conferences, despite having very few of its teams ranked in the two national Top 25 polls. [1] For the first time, in 2006, the NCAA decided to release their RPI calculations weekly starting in February. Independent sources, such as ESPN or CNN/SI, also publish their own RPI calculations, which are updated more frequently.
The RPI was updated in 2004 to account for differences in home and away games. A home win now counts as 0.6 win, while a road win counts as 1.4 wins. Conversely, a home loss equals 1.4 losses, while a road loss counts as 0.6 loss.
The strength of schedule can be calculated in many ways. Prior to American football’s Bowl Championship Series (BCS) removal for the 2004 season,[1] the SOS was calculated as follows, where OR is the opponents’ record, while OOR is the opponents’ opponents record.[2]
Other calculations include adding the opponent’s power ratings and multiplying them by the number of games, or a modification by assigning weights (higher weights for “stronger” teams).[3]
Furthermore, several more factors maybe added, such as the position of the team in the league, the strength of the team’s division or conference, which game counts in the formula and which doesn’t (vital in the Bowl Championship Series), the location of the game (see home team and home advantage) and others.
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