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Subject: Re: ELO performance?

Author: Robert Hyatt

Date: 18:27:34 05/22/99

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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 :-)
>>>   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?
>>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).

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