Author: Stephen A. Boak
Date: 13:37:37 10/23/04
Go up one level in this thread
On October 22, 2004 at 18:52:13, Uri Blass wrote: >On October 22, 2004 at 18:30:34, James T. Walker wrote: > >>On October 22, 2004 at 13:32:57, Uri Blass wrote: >> >>>go to the following link >>> >>>http://georgejohn.bcentralhost.com/TCA/perfrate.html >>> >>>enter 1400 for 12 opponents >>>enter 0 for your total score >>> >>>Your performance is 1000 but if you enter 1 to your total score your performance >>>is only 983. >>> >>>It seems that the program in that link assume that when the result is 100% or 0% >>>your performance is 400 elo less that your weakest opponent but when your score >>>is not 100% it has not that limit so they get illogical results. >>> >>>Uri >> >>My take on this is they are using a bad formula or have screwed up the program >>to calculate the Rp. >>The USCF uses Rp=Rc + 400(W-L)/N > >It seems that the USCF does not do it in that way > >They admit that the formula is not correct for players who won all their games > >Note: In the case of a perfect or zero score the performance rating is >estimated as either 400 points higher or lower, respectively, than the rating of >highest or lowest rated opponent. > >It is probably better to estimate the preformance based on comparison to the >case that the player did almost perfect score. > >Uri Dear Uri, What is the *correct* formula for a player who has won (or lost) all his games? :) Regards, --Steve
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