Valid Causal Inference with (Some) Invalid Instruments

           Jason Hartford 1 Victor Veitch 2 Dhanya Sridhar 3 Kevin Leyton-Brown 1

             Abstract                 & Powell, 2003; Darolles et al., 2011; Hartford et al., 2017;
   Instrumental variable methods provide a power        Singh et al., 2019; Bennett et al., 2019; Muandet et al., 2020;
   ful approach to estimating causal effects in the       Dikkala et al., 2020), thereby allowing nonlinear estimation
   presence of unobse ...