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ORIGINAL ARTICLE A Structural Approach to Selection Bias Miguel A. Herna´n,* Sonia Herna´ndez-Dı´az,† and James M. Robins* Abstract: The term “selection bias” encompasses various biases in
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Document Date: 2011-06-02 14:46:57
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ORIGINAL ARTICLE A Structural Approach to Selection Bias Miguel A. Herna´n,* Sonia Herna´ndez-Dı´az,† and James M. Robins* Abstract: The term “selection bias” encompasses various biases in