The rating percentage index, commonly known as the RPI, is a quantity used to rank sports teams based upon a team's wins and losses and its strength of schedule. It is one of the sports rating systems by which NCAA basketball, baseball, softball, hockey, soccer, lacrosse, and volleyball teams are ranked. This system was in use from 1981 through 2018 to aid in the selecting and seeding of teams appearing in the NCAA Division I men's basketball tournament[1] as well as in the women's tournament from its inception in 1982 through 2020.[2]
During the 2018 offseason, the NCAA announced that the RPI would no longer be used in the selection process for the Division I men's basketball tournament. Effective immediately, it was replaced with the NCAA Evaluation Tool (NET).[3][4]
In its current formulation, the index comprises a team's winning percentage (25%), its opponents' winning percentage (50%), and the winning percentage of those opponents' opponents (25%). The opponents' winning percentage and the winning percentage of those opponents' opponents both comprise the strength of schedule (SOS). Thus, the SOS accounts for 75% of the RPI calculation and is 2/3 its opponents' winning percentage and 1/3 its opponents' opponents' winning percentages.
The RPI lacks theoretical justification from a statistical standpoint. Other ranking systems which include the margin of victory of games played or other statistics in addition to the win/loss results have been shown to be a better predictor of the outcomes of future games. However, because the margin of victory has been manipulated in the past by teams or individuals in the context of gambling, the RPI can be used to mitigate motivation for such manipulation.
Some feel that the heavy emphasis upon strength of schedule gives an unfair advantage to teams from major conferences. Teams from "majors" are allowed to pick many of their non-conference opponents (often blatantly weaker teams). Teams from minor conferences, however, may only get one or two such opponents in their schedules. Also, some mid-major conferences regularly compel their member teams to schedule opponents ranked in the top half of the RPI, which could boost the strength of that conference and/or its tougher-scheduling teams. In basketball, 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.[5] In 2006, the NCAA began to release its RPI calculations weekly starting in January. Independent sources, such as ESPN or CNN/SI, also publish their own RPI calculations, which are updated more frequently.
^"NCAA News" (PDF) (Mailing list). February 15, 1981. Retrieved February 26, 2014.
^Nixon, Rick (May 5, 2020). "NCAA Evaluation Tool to replace RPI as team sorting tool for women's college basketball". NCAA.com. Retrieved March 17, 2022.
^Borzello, Jeff (August 22, 2018). "New ranking system developed for NCAA tournament, replacing RPI". ESPN.com. Retrieved August 22, 2018.
^Norlander, Matt (August 22, 2018). "The NCAA Tournament committee will select and seed teams using a new ranking system after killing the RPI". CBSSports.com. Retrieved August 22, 2018.
^"CBS Sports - News, Live Scores, Schedules, Fantasy Games, Video and more". Archived from the original on February 28, 2008.
and 27 Related for: Rating percentage index information
The ratingpercentageindex, commonly known as the RPI, is a quantity used to rank sports teams based upon a team's wins and losses and its strength of...
Chess rating system, other chess rating systems Elo hell Glicko rating system, the rating methods developed by Mark Glickman Ratingpercentageindex (RPI)...
Republican Party of India Republican Party of Iowa Ratingpercentageindex, in college sports Retail price index, UK inflation measure Revenue Protection Inspector...
football Pomeroy College Basketball Ratings, United States of America college basketball RatingsPercentageIndex (RPI), United States of America NCAA...
States during their term. An approval rating is a percentage determined by polling which indicates the percentage of respondents to an opinion poll who...
predicting the metrics the NCAA Selection Committee will use (such as ratingpercentageindex through the 2018 tournament, and the NCAA Evaluation Tool [NET]...
Quadrant (college basketball), a performance measure derived from the RatingPercentageIndex Quadrant (magazine), an Australian literary and cultural journal...
An octane rating, or octane number, is a standard measure of a fuel's ability to withstand compression in an internal combustion engine without undergoing...
correlation between a country's rating and its rate of economic growth. As examples, Sachs cited countries with good ratings in the Index, such as Switzerland and...
letter indicating the speed rating of the tire. Alternatively, the letter may appear at the end, following the load index. If the letter here is Z, indicating...
smallest percentage living below the poverty line in Europe. Moldova ranks lowest on the Human Development Index and Social Progress Index in Europe...
Universal Tennis Rating (UTR) is the global tennis player rating system intended to produce an objective, consistent, and accurate index of players' skill...
January 2018[update]. Ratings are further broken down into components including political risk, economic risk. Euromoney's bi-annual country risk index monitors the...
from a fluent shooting motion and usually on a long shot attempt. ratingpercentageindex (RPI) A tool long used by the NCAA in the selection process for...
its Nielsen Homevideo Index (NHI) in 1980 to measure cable, pay cable, and VCRs, and the NHI began offering daily cable ratings in 1982. Nielsen's continued...
In 2016, the ACC was ranked as the top baseball conference by RatingPercentageIndex (RPI); the conference has ranked among the top three by this measure...
second overall in the Big South Conference. They had the highest RatingPercentageIndex (RPI) in the league, and the highest in team history. Gardner-Webb...
Rochelle. After inheriting a program that was 10th to last in the RatingsPercentageIndex (RPI), the Gaels improved to a Top 80 RPI in 2009–10, the highest...
United States (FAA LID code) Opponents' Winning Percentage, used in calculating a team's ratingpercentageindex in sports This disambiguation page lists articles...
of the national region with great international significance The high percentage of residents employed in the services sector and information sector High-quality...
In January 2017 the NCAA began looking to replace the Ratingpercentageindex as the rating system used as the primary team sorting tool by the selection...
finishing with the most wins (a 6–1–1 record) and the highest ratingpercentageindex in the MAC East. Bowling Green finished first in the MAC East with...
from a borehole. Total core recovery (TCR) is the borehole core recovery percentage. TCR is defined as the quotient: T C R = ( l s u m o f p i e c e s...
Global Information