TY  - RPRT
        AU  - Frölich, Markus
AU  - Huber, Martin
        TI  - Treatment Evaluation with Multiple Outcome Periods under Endogeneity and Attrition
        PY  - 2014/Feb/
        PB  - Institute of Labor Economics (IZA)
        CY  - Bonn
        T2  - IZA Discussion Paper
        IS  - 7972
        UR  - https://www.iza.org/publications/dp7972
        AB  - This paper develops a nonparametric methodology for treatment evaluation with multiple outcome periods under treatment endogeneity and missing outcomes. We use instrumental variables, pre-treatment characteristics, and short-term (or intermediate) outcomes to identify the average treatment effect on the outcomes of compliers (the subpopulation whose treatment reacts on the instrument) in multiple periods based on inverse probability weighting. Treatment selection and attrition may depend on both observed characteristics and the unobservable compliance type, which is possibly related to unobserved factors. We also provide a simulation study and apply our methods to the evaluation of a policy intervention targeting college achievement, where we find that controlling for attrition considerably affects the effect estimates.
        KW  - panel data
KW  - weighting
KW  - endogeneity
KW  - attrition
KW  - treatment effect
        ER  -