Tchetgen Tchetgen, Eric J.; Robins, James - In: Statistics & Probability Letters 82 (2012) 5, pp. 907-915
proportional hazards marginal structural model for point exposure. Under the key assumption that unmeasured confounding is absent … no unmeasured confounding can seldom be established with certainty with observational data, a second contribution of the … current paper is to propose a general framework for estimation without the assumption of no unmeasured confounding. For this …