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Subject: Re: Jeff Sonas' proposal for an improved rating system

Author: Antonio Dieguez

Date: 22:04:41 02/08/03

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On February 08, 2003 at 06:28:00, Dave Gomboc wrote:

>On February 08, 2003 at 03:30:34, Peter Kappler wrote:
>
>>
>>He has some good ideas.
>>
>>http://www.worldchessrating.com/521683950.html?529637011233717
>>
>>-Peter
>
>The one thing that always bugs me about Sonas's stuff is that he takes the data,
>does some fitting on it, then says "see, this fits the data better!".  Well, of
>course it does!

yes and that's good. "Some fitting", you are being despective with the way he
does it. I don't see anything so weird or so senseless.

Let imagine if I only tune the K factor with real data instead of no data. If I
do that, I wonder who can't believe that's no good. And so on with a few other
things. If there were a sound theory behind dictaminating wich should be the
best k then it is other thing though.

> What he should do is have training data that is *distinct* from
>his testing data, e.g. tune his formulae on results from (for example)
>1990-1995, then test on (for example) 1996-2000.

and after test and correct, end up with the same thing... just kidding

> Tuning on 1990-2000, then
>testing on 1990-2000 is bogus.

he is tuning on 1990-2000 and betting it will work better for other periods.



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