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A Non-Parametric Robust Estimation of the Box-Cox Transformation for Regression Models


  • Elkin Castaño


In regression analysis, it is frequently required to transform the dependent variable in order to obtain additivity and normal errors with constant variance. Box and Cox (1964) proposed a parametric power transformation based on the assumption of normality with the aim to achieve these goals. However, some authors such as Carroll (1980, 1982b), Bickel and Doksum (1981), Powell (1991), Chamberlain (1994), Buchinsky (1995), Marazzi and Yohai (2004) and Fitzenberger et al. (2005) have pointed out that this transformation is not robust to the presence of outliers, and propose robust estimators for the transformation parameter by replacing the normal likelihood with an objective function that is less sensitive to them. This paper presents a non-parametric alternative procedure for obtaining a power transformation within the Box-Cox family which is robust to the presence of outliers in the dependent variable. The procedure is an extension of the one proposed by Castaño (1994, 1995) for a symmetry transformation of a dataset.

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  • Elkin Castaño, 2011. "A Non-Parametric Robust Estimation of the Box-Cox Transformation for Regression Models," Lecturas de Economía, Universidad de Antioquia, Departamento de Economía, issue 75, pages 89-106.
  • Handle: RePEc:lde:journl:y:2011:i:75:p:89-106

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    More about this item


    Box-Cox transformation; robust estimator; non-parametric estimator; outliers;

    JEL classification:

    • C14 - Mathematical and Quantitative Methods - - Econometric and Statistical Methods and Methodology: General - - - Semiparametric and Nonparametric Methods: General
    • C15 - Mathematical and Quantitative Methods - - Econometric and Statistical Methods and Methodology: General - - - Statistical Simulation Methods: General
    • C51 - Mathematical and Quantitative Methods - - Econometric Modeling - - - Model Construction and Estimation


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