Causality, Causal Inference, Backdoor, Frontdoor, Instrumental Variable.
a more advanced method which allows more room for misspecification of the model. To get an unbiased estimate of the causal effect it is enough to correctly specify either the propensity score model or the outcome regression model. dr_fit <- drgee::drgee(oformula=y~bd, eformula=x~bd, iaformula=~bd,