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The Bias of the Gini Coefficient due to Grouping


  • Tom Van Ourti

    () (Erasmus University Rotterdam, the Netherlands)

  • Philip Clarke

    () (University of Sydney, Australia)


Read also the publication in the 'Review of Economics and Statistics' , 2010, 93(3), 982-994. We propose a first order bias correction term for the Gini index to reduce the bias due to grouping. The first order correction term is obtained from studying the estimator of the Gini index within a measurement error framework. In addition, it reveals an intuitive formula for the remaining second order bias which is useful in empirical analyses. We analyze the empirical performance of our first order correction term using income data for 15 European countries and the US, and show that it reduces a considerable share of the bias due to grouping.

Suggested Citation

  • Tom Van Ourti & Philip Clarke, 2008. "The Bias of the Gini Coefficient due to Grouping," Tinbergen Institute Discussion Papers 08-095/3, Tinbergen Institute.
  • Handle: RePEc:tin:wpaper:20080095

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    More about this item


    Gini index; grouped data; measurement error; first-order correction;

    JEL classification:

    • C19 - Mathematical and Quantitative Methods - - Econometric and Statistical Methods and Methodology: General - - - Other
    • D31 - Microeconomics - - Distribution - - - Personal Income and Wealth Distribution
    • I30 - Health, Education, and Welfare - - Welfare, Well-Being, and Poverty - - - General

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