Standard Deviation of PT Stats (Light Math)

[jrz1972]

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Basically, you can be about 99% confident that your "true" winrate is within 3 standard deviations on either side of your current average winrate after 13K hands. I believe the confidence interval for just one SD is about 78% or so.

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You're getting "standard deviation" confused with "standard error."

Chris had a thread a while back describing how to go from SD to SE and how to estimate the confidence interval of your winrate.