Author: Peter Fendrich
Date: 15:35:13 05/23/99
Go up one level in this thread
On May 22, 1999 at 21:27:34, Robert Hyatt wrote: >On May 22, 1999 at 18:11:52, Peter Fendrich wrote: > >>On May 22, 1999 at 15:25:52, Robert Hyatt wrote: >> >>>On May 22, 1999 at 12:53:55, Stefan Meyer-Kahlen wrote: >>> >>>>Just two questions concerning ELO performance and probabilities: >>>> >>>>* How do I calculate my ELO performance if I get x percent out of y games >>>>against an opponent with z ELO points? >>>> >>>>* In which range is my own ELO rating with 95% probability after that match? >>>> >>>>I guess those are FAQs with 95% probability :-) >>>> >>>>Thanks >>>> Stefan >>> >>> >>>Performance rating is trivial. compute the following: >>> >>>number_wins * (opponent's rating +400) >> >>This is not the *ELO* performance rating but probably one of all the national >>variation that there is... USCF? >> >>//Peter >>>number_draws * opponent's rating >>>number_losses * (opponent's rating - 400) >>> >>>add those up, divide by number of games. >>> >>>there is no "95%" probability for a performance rating... > > >That is the only "performance rating" formula I have ever seen used. There are >alternative ways to represent it... ie > >TPR = opponents_rating + (400*(W-L))/N > >and so forth.. but they are all the same. If you know of another one, please >post it... (btw "elo performance rating" doesn't (to me) imply that this is >in Elo's book, just that it is an estimated "Elo rating" based on nothing but >your opponent's rating, regardless of what yours is to start with). That's true and the elo performance rating formula below is just that. What you are proposing is a linear approximation of the Performance Rating. It is not USCF as I thought. In fact it is also mentioned by Dr. Elo. The purpose with this, from what I can understand, is to easyly calculate the performance rating by hand. The original performance rating is: Rc + D(P) where Rc is the opponents average rating. D(P) is the expected rating difference with the current win percentage P. D(P) is based on the Bell curve. //Peter
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