Imagine that in a cohort study 10% of all exposed people were misclassified as unexposed.
(a) Is this misclassification random or systematic? Non-differential or differential? And why?
(b) What effects would the misclassification have on the incidence of disease in (i) the exposed cohort and (ii) the unexposed cohort?
(c) What effect would this have on the observed relative risk?
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