the) satisfaction of conditional IV independence when controlling for covariates measured (a) prior to the instrument, (b … instrument and the potential outcomes. The plausibility of conditional IV independence crucially depends on the timing when the … Vietnam War draft risk as instrument either for veteran status or education to estimate the effects of these variables on …

endogeneity and attrition/non-response bias, using two instrumental variables. Making use of a discrete instrument for the … treatment and a continuous instrument for non-response/attrition, we identify the average treatment effect on compliers as well …

treated irrespective of the instrument) under treatment and (ii) of the never takers (never treated irrespective of the … instrument) under non-treatment. The point identified means must lie within their respective bounds, which provides four testable …

This paper proposes tests for instrument validity in sample selection models with non-randomly censored outcomes. Such … models commonly invoke an exclusion restriction (i.e., the availability of an instrument affecting selection, but not the … of the instrument value. As the point must lie within its bounds, this yields two testable inequality constraints. We …

endogeneity and attrition/non-response bias, using two instrumental variables. Making use of a discrete instrument for the … treatment and a continuous instrument for non-response/attrition, we identify the average treatment effect on compliers as well …