LECTURE 3 June 8 2007 Cohort Studies, Selection Bias Survival analysis - PowerPoint PPT Presentation

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LECTURE 3 June 8 2007 Cohort Studies, Selection Bias Survival analysis

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Diseases may be ascertained directly, or may also have already occurred. ... Observer bias if disease ascertained at same time. Blind observers to study hypothesis ... – PowerPoint PPT presentation

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