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They said that you really can't use other players hands because there is not enough data and the sample is 'biased'.


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And, to misuse a statistical term like 'bias' weakened the book as a whole for me.

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As a whole? [img]/images/graemlins/confused.gif[/img] How much did you read?
You're kidding, right? Maybe you read it quickly but the bias referred to is that the hands you have on other people all have you at the table. So you are missing their hands in which you do not take part. The paragraph was about estimating the 'true' winrate of someone in your database.