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Mean-squared-error Calculations for Average Treatment Effects

Author

Listed:
  • Guido W. Imbens

    (Department of Economics, UC Berkeley and NBER)

  • Whitney Newey

    (Department of Economics, MIT)

  • Geert Ridder

    (Department of Economics, University of Southern California)

Abstract

This paper develops a new nonparametric series estimator for the average treatment effect for the case with unconfounded treatment assignment, that is, where selection for treatment is on observables. The new estimator is efficient. In addition we develop an optimal procedure for choosing the smoothing parameter, the number of terms in the series by minimizing the mean squared error (MSE). The new estimator is linear in the first-stage nonparametric estimator. This simplifies the derivation of the MSE of the estimator as a function of the number of basis functions that is used in the first stage nonparametric regression. We propose an estimator for the MSE and show that in large samples minimization of this estimator is equivalent to minimization of the population MSE.

Suggested Citation

  • Guido W. Imbens & Whitney Newey & Geert Ridder, 2006. "Mean-squared-error Calculations for Average Treatment Effects," IEPR Working Papers 06.57, Institute of Economic Policy Research (IEPR).
    • Handle: RePEc:scp:wpaper:06-57
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    Keywords

    Nonparametric Estimation; Imputation; Mean Squared Error; Order Selection;
    All these keywords.

    JEL classification:

    • C14 - Mathematical and Quantitative Methods - - Econometric and Statistical Methods and Methodology: General - - - Semiparametric and Nonparametric Methods: General
    • C20 - Mathematical and Quantitative Methods - - Single Equation Models; Single Variables - - - General

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