Sigma
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Sigma is the uncertainty around your Mu. New players are assigned a Sigma of 25/3 (8.333...), and sigma tends towards zero until it settles to a value of approximately 1 after a few hundred games. The value of sigma is synonymous with the experience of a player. The lower your sigma, the more games you've played, and by implication the more experience you have. Sigma tends towards zero regardless of whether you've won or lost a game.
Low values for sigma lead to small changes being applied to your Mu, since the system is relatively confident that it has managed to settle on your true skill rating.
Technical details
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