R语言做了两样本孟德尔随机化(MR),用network(two-step)MR做中介分析,Proportion mediated = Indirect effect / Total effect= (a*b) / c
the MR analysisfrom exposure to mediator getting an estimate of a; the MR analysis frommediator to outcome getting an estimate of b, and the MR analysisfrom exposure to outcome getting an estimate of c.
怎么用delta法求Proportion mediated的置信区间呢


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