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Topic: Ratings Percentage Index

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	2003-2004 Ratings Percentage Index
		The Ratings Percentage Index is one of the NCAA's selection criteria for college hockey.
		rating system comparison page; in particular, it is calculated with a tie counting as half a win and half a loss.
		RHEAL rating systems, while only considering won-lost-tied outcomes of each game, make distinctions based on which of a team's games it won or lost (so that beating a good team and losing to a bad team will get you more highly ranked than losing to a good team and beating a bad team).
	www.slack.net /~whelan/tbrw/2004/rpi.shtml (959 words)

	Explanation of Wobus Rankings and Ratings
		This rating uses roughly the same data incorporated into the RPI ("Ratings Percentage Index"), developed by the NCAA for use with a number of sports (not including Division I-A Football) to help choose and seed teams in the respective NCAA tournaments.
		This rating is not so easily described and has been called "advanced" mathematics (Wilson's list of CF Ratings), though I freely admit that other folks employ techniques that would take me a long while to comprehend.
		While my ratings and rankings are among those produced by formula, there are also folks who produce ratings and rankings based upon their own judgment, as well as rankings based on the results of polls of various interested and knowledgeable groups.
	www.vaporia.com /sports/explanation.html (1216 words)

	2002-2003 Ratings Percentage Index
		rating system comparison page; in particular, it is calculated with a tie counting as half a win and half a loss.
		RHEAL rating systems, while only considering won-lost-tied outcomes of each game, make distinctions based on which of a team's games it won or lost (so that beating a good team and losing to a bad team will get you more highly ranked than losing to a good team and beating a bad team).
		One ranking system which, like the RPI, considers only a team's overall winning percentage and the strengths of the teams they played, is the Bradley-Terry ranking system, which goes under the name of KRACH when applied to college hockey.
	slack.net /~whelan/tbrw/2003/rpi.shtml (999 words)

	Standard Rankings
		A key rating used in all college sports is the RPI (ratings percentage index).
		In order to produce something resembling an RPI rating, the final team ratings should be multiplied by 0.25 (basketball and baseball), 0.35 (hockey), or 0.334 (football) and increased by 0.5.
		The pairwise rating shown on my ranking page is the percent of comparisons won rather than the number of comparisons.
	www.dolphinsim.com /ratings/info/rpi.html (1985 words)

	Description of calculated Data
		Note that this is calculated by averaging the individual team ratings.
		The standard scores are averaged per game for an offensive and defensive rating which are summed for the final power rating.
		The defensive P rating is scaled down as it tends to inflate rankings.
	www2.latech.edu /~dan/wbball/info.html (906 words)

	Tom Markiewicz » RPI rankings and calculations
		For those uninitiated in this arcane metric for college basketball, the Ratings Percentage Index (RPI) is the formula used by the NCAA to rate both men’s and women’s college basketball teams.
		The Rating Percentage Index (RPI) was created in 1981 to provide supplemental data for the Division I Men’s Basketball Committee in its evaluation of teams for at-large selection and seeding of the championship bracket.
		Ken Pomeroy has a re-creation of the Ratings Percentage Index for the 2005 NCAA men’s college basketball season.
	www.tmarkiewicz.com /rpi-rankings-and-calculations (318 words)

	Explanation of Wobus RPI Calculation
		The RPI ("Rating Percentage Index" or "Ratings Percentage Index") assigns a numerical rating to each of a group of competing teams.
		The opponents' winning percentages are averaged and the result comprises the second item of the basic formula.
		Once again, as the average of these opponents' opponents' average winning percentages is calculated, if the team in question plays that opponent two or more times, then that opponents "average opponents' winning percentage" is included in the team's average that number of times.
	www.vaporia.com /sports/rpi.html (590 words)

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		These are calculated after each regional advisory committee member ranks all teams in his division and all of their opponents on a one-through-five basis, with a "one" being the highest rating.
		Opponents' total rating points are divided by a team's total number of games to arrive at a strength-of-schedule index.
		A team may have an excellent winning percentage, but the strength of schedule and results against teams already in the tournament also must be examined.
	www.lax.com /stories/414 (2893 words)

	Snurcher's Guide: Index to Ratings
		Ratings for the United States are expressed as ratings points; they are frequently referred to as "the Nielsens", after the company that tracks them.
		A rating is a percent of the universe that is being measured, most commonly discussed as a percent of all television households.
		Ratings for the UK are expressed as millions of households; they are tracked by the Broadcasters' Audience Research Board, aka "BARB".
	www.snurcher.com /indices/ratings.shtml (615 words)

	SEBaseball.com - The Problems with the RPI for Baseball
		The RPI is one way to try to infer which of two teams who haven't played each other should be ranked higher, using the quality of their respective schedules to determine the relative values of their records.
		In basketball, a player in a 3-game tournament who hits 2 of 10 shots, then 3 of 6, then 4 of 10 would have a shooting percentage of (.200 +.500 +.400)/3 =.433, when in fact for the tournament she was 9 for 25 =.360.
		Even if we were to correct the calculation for OWP to be a true percentage, and correct the OOWP calculation so that no game played contributed to more than one component, the formula would still not be a very good one.
	sebaseball.rivals.com /content.asp?CID=310988 (1133 words)

	Tournament History - NCAA Sports.com
		The contest re¬ceived a rating of 20.5 and was seen by 13,580,000 tele¬vision households reaching a total audi¬ence of 39 million persons.
		The Ratings Percentage Index (RPI) was computed for the nonconference schedules of all eligible conferences, with those with the lowest ranking com¬peting for the available automatic-qualifying po¬sitions.
		The weighting of the three factors comprising the ratings percentage index (RPI), Division I winning percentage, oppo¬nents' winning percentage and opponents' opponents’ winning per¬centage, was adjusted from 20-40-20 to 25-50-25.
	www.ncaasports.com /basketball/mens/story/9033549 (3309 words)

	CHN Basketball History: Rating Percentage Index
		Commonly known as 'RPI,' the Ratings Percentage Index is a rating system where NCAA basketball teams are ranked.
		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 heavy emphasis upon strength of schedule is seen, by many, to give an unfair advantage to major conferences, which are allowed to fill several slots where smaller conferences may only get one slot.
	www.collegehoopsnet.com /history/ratingspercentageindex.htm (201 words)

	Illinois Water Polo - Rankings Section
		From all the new terminology to the different ratings, it can be easy to get lost in the shuffle.
		This index changes as the opponents you have faced move in the complete rankings.
		Ratings Percentage Index (RPI) - A complicated yet accurate index which calculates your winning percentage with your strength of schedule to determine where you rank compared to other teams.
	www.illpolo.com /rankinfo.htm (292 words)

	Sports: Greenberg says RPI criteria don't add up
		TAMPA -- Men's basketball coach Seth Greenberg is an outspoken critic of the Ratings Percentage Index, the formula used to assist in selecting the NCAA Tournament field.
		It is 25 percent your winning percentage, 50 percent your opponents' (collective) winning percentage, 25 percent your opponents' opponents winning percentage.
		He's rated ahead of notables such as Cincinnati's Steve Logan and Maryland's Juan Dixon, according to nbadraft.net.
	www.sptimes.com /2002/02/19/news_pf/Sports/Greenberg_says_RPI_cr.shtml (607 words)

	Ratings, rankings and polls
		Strength-based ratings (including predictive statistical models and power ratings) are based on other factors in addition to past performance, such as injuries, changes in personnel and fitness.
		Elo ratings were developed in 1959 by Arped Elo, a professor of physics at Marquette University and a former president of the American Chess Federation.
		Results (percentage scores) are converted to rating differences by means of a simple table look-up.
	members.aol.com /jonagrm/soccer/rankings.htm (1723 words)

	A UDPRIDE EXCLUSIVE (Site not responding. Last check: 2007-10-28)
		Usually it's the RPI (Ratings Percentage Index), but occasionally Jeff Sagarin's ratings are mentioned.
		Were you not to do this, an opponents' opponent with a 27-0 record would count far more than an opponents' opponent with a record of 3-0 because of the totality of the games involved.
		Opponents winning percentage is worth 60% (.600) of a team's score, with bonus/penalty multipliers factored in.
	www.udpride.com /archives/20030119.htm (1599 words)

	The NCAA News: News & Features (Site not responding. Last check: 2007-10-28)
		In Division I, team selection criteria was reorganized to match the criteria used to rate individual teams, while the Division III committee reworded its criteria for clarity.
		The committee also made recommendations regarding the ratings percentage index, which was used for the first time last year as a tool in the team-selection process.
		In other actions regarding the index, the committee responded to a Division I Championships/Competition Cabinet request that the index be used as the sole determinant in selecting automatic-qualifying conferences.
	www.ncaa.org /news/1998/19980223/active/3508n18.html (1152 words)

	2006-07 College Basketball Computer Ratings
		Rating /--Conference---\ /---Over-all----\ Perf W L Pts Opp W L Pts Opp Rate - - --- --- - - --- --- ---- Davidson 20 1 1710 1407 29 5 2765 2336 716 Appalachian St. 16 4 1546 1332 25 8 2508 2239 698 Col.
		Rating /--Conference---\ /---Over-all----\ Perf W L Pts Opp W L Pts Opp Rate - - --- --- - - --- --- ---- Gonzaga 13 3 1249 1074 23 11 2668 2383 720 Santa Clara 11 5 1128 1018 21 10 2131 1956 701 St.
		Rating /--Conference---\ /---Over-all----\ Perf W L Pts Opp W L Pts Opp Rate - - --- --- - - --- --- ---- Savannah St. 2 0 139 131 12 18 1713 1937 583 UT Val St. 12 1 971 748 22 7 2086 1756 661 N.
	talismanred.com /ratings/hoops (1476 words)

	Notes on My RPI Calculations
		A team's RPI is a sum of three values: 25% of the team's winning percentage, 50% of its opponents' average winning percentage (strength of schedule), and 25% of its opponents' opponents' average winning percentage (opponents' strength of schedule).
		For example, if a team is 2-0, and has played opponents who are 2-3 and 2-1, then the opponents' records are adjusted to 2-2 and 2-0 in order to calculate their winning percentages.
		A similar adjustment used to be made to remove each team's wins and losses from its opponents' opponents' records before calculating its opponents' opponents' winning percentage.
	veneziano.tripod.com /rpi/notes.html (372 words)

	GoRacers.com - Men's Basketball - News (Site not responding. Last check: 2007-10-28)
		The Racers have a Ratings Percentage Index (RPI) of 88.
		They are ranked 131st in the Sagarin ratings and are 11-7 overall and tied for second in the Ohio Valley Conference with a 6-2 mark.
		The Owls are 10-7 overall and are tied for fourth in the WAC with a 5-4 record.
	www.goracers.com /mens/basketball/0405/bracketbuster.html (362 words)

	WinPicks Software for NFL, NBA, college basketball and college football predictions and handicapping
		The power ratings for both NFL and college football assume that the game is being played at a neutral site, and a home field advantage needs to be added or subtracted to obtain the final prediction.
		The home/away rating weighting factors were added to WinPicks based on changes made to the RPI in December 2004 for college basketball.
		All published sources of the RPI rating we have found do not disclose the opponent winning percentages and the opponent's opponent winning percentages which were used to calculate the RPI rating, unlike WinPicks.
	www.microbro.com /manual/sec7-6.htm (902 words)

	NCAA Women's Basketball RPI
		The Ratings Percentage Index, or RPI, is a formula used by the NCAA to help determine which teams go to post-season tournaments and how they are seeded.
		To be precise, it rates teams according to where, on average, their margins of victory fall on a normal distribution of the year's NCAA women's basketball results.
		To predict the result of a game, take the rating of the home team, add the mean home advantage, and subtract the rating of the visiting team.
	veneziano.tripod.com /rpi/index.html (314 words)

	Rating the Ratings Systems
		Ratings systems are used for the purpose evaluating teams objectively, and have taken quite a hold in the college sports arena, from the BCS (Bowl Championship Series) method for selecting college football bowl berths, to the RPI (ratings percentage index) system used to some degree in NCAA tournament selection in college basketball.
		Ratings systems are motivated by the need to factor in schedule strength in cases where the size of the league is large and the quality of teams' schedules vary considerably; cases where the straight win-loss record is not informative enough.
		This is a shame, because with all the effort going into ratings systems, we could have learned a lot more about what is important for a quality ratings system, and, equally importantly, how well they actually perform.
	www.eg.bucknell.edu /~bvollmay/BB/ratings_theory.html (407 words)

	NWI.com on TownNews
		A soft, whirring computer is sweet music for Jim Sukup, college basketball's guru of quality wins and strength of schedule, the man who broke the code for the Ratings Percentage Index.
		He has made the RPI mainstream, shining a light on the secret that is protected so zealously by the NCAA.
		Sukup, of Carmel, Ind., begins by applying values to team performance -- 25 percent for winning percentage, 50 percent for schedule strength and 25 percent for opponent's schedule strength -- and then goes from there.
	nwitimes.com /articles/2002/03/10/export3314.eml (623 words)

	Don't worry about the RPI; just win - College Basketball Sporting News, The - Find Articles
		For all the consternation generated by the Ratings Percentage Index, its enemies should remember there are more ominous ways to rearrange the letters that form its handy acronym.
		It is calculated by combining three elements: the team's winning percentage (25 percent of the total), its opponents' winning percentage (50 percent) and the winning percentage of the opponents' opponents (25 per cent).
		But even a ratings system that factors in game sites is going to be influenced by a team that wins 10 or 11 nonconference home games.
	findarticles.com /p/articles/mi_m1208/is_9_227/ai_98172092 (938 words)

	v7n85
		However, winning an at-large berth may be difficult since the Ratings Percentage Index, or RPI, does not look too kind on the 49ers.
		RPI factors three things: Division I winning percentage which accounts for 25 percent, strength of schedule which is 50 percent and the remaining 25 percent accounts for the opponent's strength of schedule.
		Since 1993-94 the lowest rated RPI team ever to make the field of 64 was New Mexico with a 75 last year.
	www.csulb.edu /~d49er/spring00/sports/v7n85-earn.html (696 words)

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