On Mendelian randomization analysis of case‐control study

Mendelian randomization (MR) analysis uses genotypes as instruments to estimate the causal effect of an exposure in the presence of unobserved confounders. The existing MR methods focus on the data generated from prospective cohort studies. We develop a procedure for studying binary outcomes under a case‐control design. The proposed procedure is built upon two working models commonly used for MR analyses and adopts a quasi‐empirical likelihood...