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Subject: Re: Rating swings on ICC

Author: Don Dailey

Date: 11:32:55 08/02/98

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On August 02, 1998 at 12:58:38, Bruce Moreland wrote:

>
>On August 02, 1998 at 09:37:24, Don Dailey wrote:
>
>>I wonder why they don't give people the option to use a smaller
>>K factor?
>
>It could just as easily be server-wide, pick one value that works.
>
>If you allow two opponents with different K values to play against each other,
>you will create new points if the over-rated one has a small K, and you will
>destroy points if the over-rated one has a large K.
>
>bruce


I think the effects of inflation or deflation would balance out
in the long run.  But if rapidly improving players tended to
prefer high K values then the pool would tend to inflate.  I think
the right way to control inflation or deflation is to pick out
a few active players who have well established Fide ratings and
make very minor adjustments over a period of time to keep these
in line.  For instance when anyone wins, they can be given slightly
less points (like a fraction of a point) until the the pool was
normalized if you wanted to deflate the rating pool.   How do
they determine the ratings anyway?  Did they start with ratings
of known players?   There is bound to be inflation or deflation
over time anyway, in any system that is open like this.

- Don



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