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The Phantom Menace of Omitted Variables. A Comment

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  • Vance, Colin
  • Ritter, Nolan

Abstract

This note demonstrates that in applied regression analysis, the variance of a coefficient of interest may decrease from the inclusion of a control variable, contrasting with Clarke’s assertion (2005, 2009) that the variance can only increase or stay the same. Practitioners may thus be well advised to include a relevant control variable on this basis alone, particularly when it is weakly correlated with the variable of interest.

Suggested Citation

  • Vance, Colin & Ritter, Nolan, 2012. "The Phantom Menace of Omitted Variables. A Comment," EconStor Open Access Articles and Book Chapters, ZBW - Leibniz Information Centre for Economics, vol. 29(2), pages 233-238.
    • Handle: RePEc:zbw:espost:122943
    DOI: 10.1177/0738894211433169
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    References listed on IDEAS

    as
    1. Joshua D. Angrist & Jörn-Steffen Pischke, 2009. "Mostly Harmless Econometrics: An Empiricist's Companion," Economics Books, Princeton University Press, edition 1, number 8769.
    2. Sebastian Galiani & Paul Gertler & Ernesto Schargrodsky, 2005. "Water for Life: The Impact of the Privatization of Water Services on Child Mortality," Journal of Political Economy, University of Chicago Press, vol. 113(1), pages 83-120, February.
    3. Roderick J. Little & Qi Long & Xihong Lin, 2009. "A Comparison of Methods for Estimating the Causal Effect of a Treatment in Randomized Clinical Trials Subject to Noncompliance," Biometrics, The International Biometric Society, vol. 65(2), pages 640-649, June.
    4. Kevin A. Clarke, 2005. "The Phantom Menace: Omitted Variable Bias in Econometric Research," Conflict Management and Peace Science, Peace Science Society (International), vol. 22(4), pages 341-352, September.
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    Cited by:

    1. Arndt R. Reichert, 2015. "Obesity, Weight Loss, and Employment Prospects: Evidence from a Randomized Trial," Journal of Human Resources, University of Wisconsin Press, vol. 50(3), pages 759-810.
    2. Arndt Reichert, 2012. "Obesity, Weight Loss, and Employment Prospects – Evidence from a Randomized Trial," Ruhr Economic Papers 0381, Rheinisch-Westfälisches Institut für Wirtschaftsforschung, Ruhr-Universität Bochum, Universität Dortmund, Universität Duisburg-Essen.
    3. Kevin A. Clarke, 2012. "More Phantom Than Menace1," Conflict Management and Peace Science, Peace Science Society (International), vol. 29(2), pages 239-241, April.
    4. Simora, Michael & Frondel, Manuel & Vance, Colin, 2018. "Does financial compensation increase the acceptance of power lines? Evidence from Germany," Ruhr Economic Papers 742, RWI - Leibniz-Institut für Wirtschaftsforschung, Ruhr-University Bochum, TU Dortmund University, University of Duisburg-Essen.
    5. repec:zbw:rwirep:0381 is not listed on IDEAS
    6. Simora, Michael & Frondel, Manuel & Vance, Colin, 2020. "Do financial incentives increase the acceptance of power lines? Evidence from Germany," Regional Science and Urban Economics, Elsevier, vol. 85(C).

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    More about this item

    Keywords

    control variables; model specification; variance;
    All these keywords.

    JEL classification:

    • C12 - Mathematical and Quantitative Methods - - Econometric and Statistical Methods and Methodology: General - - - Hypothesis Testing: General
    • C15 - Mathematical and Quantitative Methods - - Econometric and Statistical Methods and Methodology: General - - - Statistical Simulation Methods: General
    • C18 - Mathematical and Quantitative Methods - - Econometric and Statistical Methods and Methodology: General - - - Methodolical Issues: General

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