Author: Chris Carson
Date: 12:02:39 06/03/02
Go up one level in this thread
On June 03, 2002 at 14:51:23, Sune Fischer wrote: >On June 03, 2002 at 14:39:22, Sune Fischer wrote: > > >>You have >>Elo_1970(strength)=F(T_1970(strength)) and >>Elo_2002(strength)=G(T_2002(strength)), now F(T(..)) and G(T(..)) are known >>distributions, namely the ratinglists. >>But we want to find how the strength evolved in time, how do we do that? >> >>If you treat F,G and T as unknowns (as I do), then you will get nowhere in you >>analysis, you need to make assumtions or approksimations, that is unless I'm >>overlooking something ;) > >Perhaps >Elo_1970(strength)=F(S(1970),1970) and >Elo_2002(strength)=G(S(2002),2002), would have been a better nameing >convention;) >So S is strength as function of time, and F and G are inflations, also functions >of time. >It seems hard to seperate S(time) from the other unknown functions, but perhaps >statistics has methods? > >-S. I will give your comments some thought, my opinion is that you are making this more complicated than it is, but I will consider it. My opinion is that FIDE ELO 1972 can be compared to FIDE ELO 2002. There may be an inflation component (constant or percentage or time dependant variable or ...), but if an inflation component exists, then the comparison is still valid with the time component factored in. I also think a good question is how significant is the inflationary component?
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