Wednesday, August 09, 2017

how to estimate the risk and relative risk from logistic regression

How to estimate the risk and relative risk from logistic regression of a case-control study (OR to RR)
One advantage of odds ratios is that we can estimate it in a case-control study, when we usually oversample the cases. However, we cannot directly calculate the probability using logistic regression in a case-control study, since the beta(0) of the case-control study cannot represent the target population, which beta(0) of the target population is equal to beta(0) of the case-control study - log(sampling probability for cases/sampling probability for controls).

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