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Confirmation, Correction and Improvement for Outlier Validation Using Dummy Variables: t-Statistics or F-Incremental Statistics is not enough in OLS

Author

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  • Arzdar Kiraci

    (Siirt University, Faculty of Economics and Administrative Sciences.)

Abstract

Dummy variables can be used to detect, validate and measure the impact of outliers in data. This paper uses a model to evaluate the effectiveness of dummy variables in detecting outliers. While generally confirming some findings in the literature, the model refutes the presumption that the t˗statistic or the F-incremental statistic is enough to validate an observation as an outlier. In order to rectify this fallacy, this paper recommends an easily-calculable robust standardized residual statistic that is more compatible with the definition of outliers.The robust standardized residual statistic suggested herein is still used in many robust regression methods and is more effective than the t-statistic or the F-incremental statistic in validating outliers with dummy variables. The results of this study suggest some practical recommendations for dealing with outliers and improvements in maintaining the integrity of data. We recommend all previous studies using this statistics be revised in light of the findings presented in this paper.

Suggested Citation

  • Arzdar Kiraci, 2013. "Confirmation, Correction and Improvement for Outlier Validation Using Dummy Variables: t-Statistics or F-Incremental Statistics is not enough in OLS," International Econometric Review (IER), Econometric Research Association, vol. 5(2), pages 43-52, September.
    • Handle: RePEc:erh:journl:v:5:y:2013:i:2:p:43-52
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    References listed on IDEAS

    as
    1. Frees,Edward W., 2004. "Longitudinal and Panel Data," Cambridge Books, Cambridge University Press, number 9780521828284, January.
    2. Zaman, Asad & Rousseeuw, Peter J. & Orhan, Mehmet, 2001. "Econometric applications of high-breakdown robust regression techniques," Economics Letters, Elsevier, vol. 71(1), pages 1-8, April.
    3. Frees,Edward W., 2004. "Longitudinal and Panel Data," Cambridge Books, Cambridge University Press, number 9780521535380, January.
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    More about this item

    Keywords

    Dummy Variable; t-Statistic; Outlier; Robust Dummy Statistic; Robust Standardized Residual;
    All these keywords.

    JEL classification:

    • C2 - Mathematical and Quantitative Methods - - Single Equation Models; Single Variables
    • C20 - Mathematical and Quantitative Methods - - Single Equation Models; Single Variables - - - General
    • C51 - Mathematical and Quantitative Methods - - Econometric Modeling - - - Model Construction and Estimation
    • C52 - Mathematical and Quantitative Methods - - Econometric Modeling - - - Model Evaluation, Validation, and Selection

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