Welcome to Ratings Central, home of the world’s most accurate rating system!

On June 1, 2019, we modified the temporal-update algorithm and reprocessed all events. Everyone’s rating changed. All historical ratings changed.

Previously, if the rating system had not seen a player for a year, the standard deviation of the player’s law increased by at most 70 points.

With the new algorithm, if the rating system has not seen a player for a year, the standard deviation of the player’s law will increase by at most 79.4 points and the mean will increase by 7 points. However, the increase in mean will not be credited until the player plays in an event. (The new temporal-update is the sum of a mean-zero normal random walk with a variance of 70² per year and a Poisson jump process with jumps of 200 points, a mean of 7 points per year, and a variance of 200 × 7 per year.)

With the new model, players sometimes get better in jumps, while before they only got better in steps.

When we reprocessed all events, the ratings of 99.99% of the players increased or stayed the same. The average gain was 42 points. Only 0.02% of players gained more than 300 points.

We were motivated to consider improvements to the algorithm by a major event director who felt that the ratings for their players were deflating. After a year of experimentation and investigation, we concluded that part of the deflation was due to their choice of priors. However, even after using better priors, there still appeared to be some deflation. A related problem is that sometimes the system can be slow to react when a player improves rapidly. We think the new temporal-update algorithm better models how player playing strengths actually change and produces more accurate ratings.

On May 26, 2019, we added new categories of examples to Examples of Point Changes.

For more information on Ratings Central, including how your club, league, or tournament can join, see Info. And, be sure to take a look at what people are saying about Ratings Central.

If you run tournaments, take a look at Zermelo. Zermelo can help you run your tournament and submit it to Ratings Central or USATT, or can be used without using Ratings Central.

Recent Events
2019-07-17BTTA Fixtures Tuesday (16/07/2019)BTTAQLDAUSTT
2019-07-16AWTTA 2019 Winter Div 1 Rd 11AWTTAVICAUSTT
2019-07-16Minnesota TC RRPTTMNUSATT
2019-07-16Loops Tuesday Night Season 5 Division 3 R0HWATTVICAUSTT
2019-07-15NTTC 2019 Club Championships Week 3NTTCAUSTT
2019-07-15Loops Monday Night Season 5 Division 2 R6HWATTVICAUSTT
2019-07-15Monday Summer LeaguePPCORUSATT
2019-07-15BTTA Fixtures Monday (15/07/2019)BTTAQLDAUSTT
2019-07-15GVTTC Summer League ’19 Week07GVTTCNYUSATT
2019-07-15Sunshine & District TTA 2019 Mon S2 - Round 7SDTTAVICAUSTT
2019-07-15NTTTA Winter 2019 Round 10NorthernAUSTT
2019-07-14Super Sunday LeaguePPCORUSATT
2019-07-132019 Australian Junior ChampionshipsAUSTT
2019-07-132019 MBTTA Veterans TournamentMBTTAQueenslandAUSTT
2019-07-13Podvin Table Tennis TournamentMNUSATT
2019-07-13Minnesota Saturday OpenMNUSATT
2019-07-13NWTTC Saturday RR MatchNWTTCMNUSATT
2019-07-13Mastiff TTC LeagueMastiff TTCMAUSATT
2019-07-13TTW Saturday SinglesWWTTNew South WalesAUSTT
2019-07-12CCTTA Competition 2 2019 - 2019-07-12CCTTAAUSTT
2019-07-12VTTA Winter Round 5 2019VTTAVICAUSTT
2019-07-122019 MVTTA Winter - Rnd 8MVTTAVICAUSTT
2019-07-11Minnesota TC RRPTTMNUSATT
2019-07-11ES&CTTA 2019 Winter A1 Rnd 10ES&CTTAVICAUSTT
2019-07-11B1 Rnd 8 WTTA Winter 2019WTTAVictoriaAUSTT

TT = Table Tennis. HTT = Hardbat Table Tennis. STT = Sandpaper Table Tennis.
Events: 32,240. Players: 91,369. Matches: 3,561,028.