[computer-go] Go rating math information

[Andy]

Yes, the math is attempting to model reality.  :)

That's why I also included the EGF data which is based on observed
statistical upset rate.  Of course those ratings are calculated using a
formula which pre-supposes an upset rate.....  Round and round.  :)


On Jan 31, 2008 1:26 PM, terry mcintyre <terrymcintyre at yahoo.com> wrote:

> From: Andy <andy.olsen.tx at gmail.com>
>
> Sorry, the KGS formula uses a constant k which is different from the
> K-factor in Elo.
> P(A wins) = 1 / ( 1 + exp(k*(RankB-RankA)) )
>
> This would be equivalent to changing the constant 400 in:
> P(A wins) = 1 / ( 1 + 10^((Ra-Rb)/400)) )
>
> EGF has a similar scheme except of course they use different letters for
> equivalent constants.  So this varying of k is what accounts for the fact
> that upsets are more likely for weak kyu players than for dan players.
>
> I think the varying k factor does not explain ( account for ) the fact
> that kyu players are more likely to win upset victories; I believe it is an
> attempt to  model the inconsistency or variability in kyu-level play.
>
> ------------------------------
> Looking for last minute shopping deals? Find them fast with Yahoo! Search.<http://us.rd.yahoo.com/evt=51734/*http://tools.search.yahoo.com/newsearch/category.php?category=shopping>
>
> _______________________________________________
> computer-go mailing list
> computer-go at computer-go.org
> http://www.computer-go.org/mailman/listinfo/computer-go/
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://computer-go.org/pipermail/computer-go/attachments/20080131/da88da92/attachment.htm