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Subject: Re: ELO and size of the population

Author: Robert Hyatt

Date: 06:29:00 10/09/03

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On October 08, 2003 at 18:31:57, Francesco Di Tolla wrote:

>On October 08, 2003 at 12:59:25, Robert Hyatt wrote:
>>When you have a large population, you end up with lots of "sub-populations"
>>with slight rating differences.  IE most of the USCF players in Birmingham
>>AL will never compete with players from Los Angeles.  There might be some
>>crossover in that LA players might play Houston TX players and they might
>>the Birmingham players.  But the larger the population, the more likely
>>this skewing happens.  With small populations it is likely everyone plays
>>everyone (my 2 for example).
>
>You made an exmple of weakly mixing system where the time averages are not
>equivalent to ensabmle averages, and only local equilibria are expected.


I would suspect "time averages" are close.  The entire world has gone to
faster time controls.  But the populations are definitely not completely
homogeneous.



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