Author: Vincent Lejeune
Date: 15:47:26 10/23/04
Go up one level in this thread
On October 23, 2004 at 16:37:37, Stephen A. Boak wrote: >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 For such a player, the error margin = infinity the perf = average opp +400 to +infinity
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