Bias.ppt - Yan He Department of Epidemiology [email protected] Bias Selection bias Information bias Confounding Selection Bias A distortion in the

Bias.ppt - Yan He Department of Epidemiology...

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Yan He Department of Epidemiology [email protected]
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Bias Selection bias Information bias Confounding
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Selection Bias A distortion in the relationship between exposure and outcome that results from selection of study participants (those who participate and those who do not participate). Berkson’s bias (admission rate bias ) Neyman bias (prevalence-incidence bias )
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Selection bias is the  bias  introduced by the selection of individuals, groups or data for analysis in such a way that proper randomization is not achieved, thereby ensuring that the sample obtained is not representative of the population intended to be analyzed. Selection Bias
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Berkson Bias
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Neyman Bias
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Information Bias Observation bias Measurement bias A distortion in measuring exposure or outcome data that results in different quality (i.e., accuracy or reliability) or frequency of information between comparison groups.
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Recall bias Differential recall of exposure between cases and controls in a study Example
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  • Spring '16
  • Congenital disorder,  Berkson’s bias

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