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.
|2019-09-19||NTTC 2019 Spring Comp B Grade R4||NTTC||AUS||TT|
|2019-09-19||2019 Divison 2 Club Championship||AWTTA||AUS||TT|
|2019-09-19||ES&CTTA 2019 Spring A1 Rnd 4||ES&CTTA||VIC||AUS||TT|
|2019-09-19||TTACT 2019 Spring Pennant Div 4 Rnd 7||TTACT||ACT||AUS||TT|
|2019-09-18||BTTA Fixtures Tuesday (17/09/2019)||BTTA||QLD||AUS||TT|
|2019-09-18||NTTC 2019 Spring Comp A Grade R4||NTTC||AUS||TT|
|2019-09-18||2019 TTV Premier League Season3 Wed Round 2||TTV||VIC||AUS||TT|
|2019-09-18||Loops Season 6 Wednesday Night Division 1 R3||HWATT||VIC||AUS||TT|
|2019-09-18||TTACT 2019 Spring Pennant Div 1 Rnd 7||TTACT||AUS||TT|
|2019-09-18||BDTTA 2019 Winter Pennant A Finals||BDTTA||Vic||AUS||TT|
|2019-09-18||Rochester, MN Wednesday League||RTTC||MN||USA||TT|
|2019-09-18||Bend TTC - September ’19 Round Robin||Bend TTC||OR||USA||TT|
|2019-09-18||Sunshine & District TTA 2019 Wed S3 - Round 7||SDTTA||VIC||AUS||TT|
|2019-09-18||2019 Winter Pennant B, C, D Grades Rnd 9||SSTT||NSW||AUS||TT|
|2019-09-18||ES&CTTA 2019 Spring B Rnd 4||ES&CTTA||VIC||AUS||TT|
|2019-09-17||2019 Divison 1 Club Championship||AWTTA||AUS||TT|
|2019-09-17||Minnesota TC RR||PTT||MN||USA||TT|
|2019-09-17||Loops Season 6 Tuesday Night Division 3 R0||HWATT||VIC||AUS||TT|
|2019-09-17||2019 DVTTA Spring Section 3 + 4 Round 04||DVTTA||VIC||AUS||TT|
|2019-09-17||NTTC 2019 Spring Comp B/R Grade R4||NTTC||AUS||TT|
|2019-09-17||GVTTC Classic League ’19-’20 Tryouts Week 2||GVTTC||NY||USA||TT|
|2019-09-17||BDTTA 2019 Winter Pennant B Finals||BDTTA||Vic||AUS||TT|
|2019-09-17||DTTC September league 2019 (III)||D TTC||NY||USA||TT|
|2019-09-17||TTACT 2019 Spring Pennant Div 3 Rnd 7||TTACT||ACT||AUS||TT|
|2019-09-17||2019 Winter Premier & A graded Rnd 9||SSTT||NSW||AUS||TT|
TT = Table Tennis. HTT = Hardbat Table Tennis. STT = Sandpaper Table Tennis.
Events: 32,871. Players: 92,327. Matches: 3,604,923.