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Subject: ELO inflation effect ... and SSDF

Author: GuyHaworth

Date: 01:52:40 10/09/02

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Totally agreed:  only the differences between the ELO numbers are relevant.

I believe there is an inflation effect in the ELO system.  Sadly, investigating
this - by theory or simulation - hasn't got to the top of my 'to do' list yet.

Anyway, the more games played, the narrower the confidence bands on ELO figures,
but the greater the inflation.

I believe it was for this reason, or for the sake of credibility, that SSDF
knocked back the absolute numbers a couple of years ago.  Maybe they knocked 100
points off or something?

Other rating systems, like Thompson's for the PCA, maybe do the rating better
with less inflation, but they haven't been widely adopted.  Perhaps that's a
pity.

g



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