Author: martin fierz
Date: 21:17:26 03/17/04
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On March 17, 2004 at 15:08:55, Christophe Theron wrote: [snip] >I think my formula is more accurate. And actually it's not _my_ formula. I have >found it somewhere, but I do not remember where. > >The real elo formula has the interesting property to be close to linear in the >20%-80% winning percentage range, hence the 80% validity limit. it's interesting that you find this interesting :-) your linear formula is simply a taylor approximation to the first order; it is always possible to do this, for any function in the vicinity of some point (except of course if the function is singular at that point). both you and uri get the coefficient wrong, because it's more or less right in the middle between 7 and 8; so some people use 7, some use 8, because it seems nobody (except dieter) can remember the real value of the first taylor coefficient, which doesn't happen to be a whole number - of course... cheers martin
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