The distribution of Levin's measure of attributable risk
Levin归因风险度量的分布
Some properties of the sample estimator of attributable risk λ, defined here as the proportion of all cases of disease which may be attributed to a risk factor, are considered for the case-control study situation. It is shown that log (1 −λ^ ) may be expressed in terms of the prevalences of the factor in cases and healthy controls, that the bias of the estimator is minimized when ½ is added to the cell frequencies corresponding to nonexposed persons in the usual 2 × 2…