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How to Control for Many Covariates? Reliable Estimators Based on the Propensity Score

  • Huber, Martin

    ()

    (University of Fribourg)

  • Lechner, Michael

    ()

    (University of St. Gallen)

  • Wunsch, Conny

    ()

    (University of Basel)

We investigate the finite sample properties of a large number of estimators for the average treatment effect on the treated that are suitable when adjustment for observable covariates is required, like inverse probability weighting, kernel and other variants of matching, as well as different parametric models. The simulation design used is based on real data usually employed for the evaluation of labour market programmes in Germany. We vary several dimensions of the design that are of practical importance, like sample size, the type of the outcome variable, and aspects of the selection process. We find that trimming individual observations with too much weight as well as the choice of tuning parameters is important for all estimators. The key conclusion from our simulations is that a particular radius matching estimator combined with regression performs best overall, in particular when robustness to misspecifications of the propensity score is considered an important property.

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Paper provided by Institute for the Study of Labor (IZA) in its series IZA Discussion Papers with number 5268.

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Length: 65 pages
Date of creation: Oct 2010
Publication status: published as 'The Performance of Estimators Based on the Propensity Score' in: Journal of Econometrics, 2013, 175 (1), 1-21
Handle: RePEc:iza:izadps:dp5268
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