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Subject: Re: OFF TOPIC: About Ratings and probabilities

Author: Jeff Lischer

Date: 14:44:13 01/21/01

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On January 21, 2001 at 16:51:11, Paulo Soares wrote:

>
>I need to know the formula that calculates the probability that has a program
>with rating x of winning another program with rating y
>
>Thanks in advanced
>
>Paulo Soares, from Brazil

The standard formula for the win expectancy (We) for program x is:

We = 1/(1 + 10^((delta rating)/400))

where (delta rating) = rating y - rating x



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