TY  - RPRT
        AU  - Lechner, Michael
        TI  - Modified Causal Forests for Estimating Heterogeneous Causal Effects
        PY  - 2018/Dec/
        PB  - Institute of Labor Economics (IZA)
        CY  - Bonn
        T2  - IZA Discussion Paper
        IS  - 12040
        UR  - https://www.iza.org/publications/dp12040
        AB  - Uncovering the heterogeneity of causal effects of policies and business decisions at various levels of granularity provides substantial value to decision makers. This paper develops new estimation and inference procedures for multiple treatment models in a selection-on-observables frame-work by modifying the Causal Forest approach suggested by Wager and Athey (2018). The new estimators have desirable theoretical and computational properties for various aggregation levels of the causal effects. An Empirical Monte Carlo study shows that they may outperform previously suggested estimators. Inference tends to be accurate for effects relating to larger groups and conservative for effects relating to fine levels of granularity. An application to the evaluation of an active labour market programme shows the value of the new methods for applied research.
        KW  - causal machine learning
KW  - statistical learning
KW  - average treatment effects
KW  - conditional average treatment effects
KW  - multiple treatments
KW  - selection-on-observable
KW  - causal forests
        ER  -