Author: Sune Fischer
Date: 16:17:19 11/02/04
Go up one level in this thread
On November 02, 2004 at 16:44:17, James T. Walker wrote: >On November 02, 2004 at 08:22:10, Sune Fischer wrote: > >>On November 02, 2004 at 07:42:24, James T. Walker wrote: >> >>>Just plot a graph with 999 data points all with a value of zero. Then plot >>>another graph of 1000 data points all with a value of zero. Then compare the >>>difference. >>>Jim >> >>Ratings can become negative, so zero is not the lowest rating possible you can >>get. Zero is actually an arbitrary number you just picked out of nowhere, you >>might as well have said -1000. >> >>The proof of this is easy, even without knowing the formula. Just consider the >>1400 guy and someone who is 400 ELO weaker, then consider one that is 400 ELO >>weaker than him and so on, you quickly get negative ratings. >> >>I don't know what the lowest rating is, even if you assume perfectly worst play >>your opponent might also be playing perfectly bad or close enough to that so you >>don't lose every time. >>You can thus never get an expected score of 0 and an equivalent rating of >>-infinity. >> >>-S. > >What is your point? To inform you that zero is arbitraty value, and that it isn't constant because even if his rating is 0 his expected score will be higher than 0. So he will lose rating if he doesn't score anything. -S.
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