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### Subject: Re: ELO performance?

Author: Tim Mirabile

Date: 11:35:55 05/22/99

Go up one level in this thread

On May 22, 1999 at 13:58:43, Peter Fendrich wrote:
>D(P) is the rating difference that P indicates. That means that P indicates what
>rating difference would be excpected with such a result.
>It is possible to compute D(P) with the help of a Bell curve but the easy way is
>a lookup table.
In Excel 97 I use D(P)=NORMINV(P,0,200*SQRT(2)) and
P(D)=NORMDIST(D,0,200*SQRT(2),TRUE)
Where D is rating difference and P is percent score in decimal form.

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