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The κ-Statistics Approach to Income Distribution Analysis

The κ-Statistics Approach to Income Distribution Analysis
  • Fabio Clementi, Mauro Gallegati, Lisa Gianmoena, Giorgio Kaniadakis, Simone Landini
  • Published online:
    11 April 2025
    Print publication:
    08 May 2025
    • Element
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  • This Element presents the κ-generalized distribution, a statistical model tailored for the analysis of income distribution. Developed over years of collaborative, multidisciplinary research, it clarifies the statistical properties of the model, assesses its empirical validity and compares its effectiveness with other parametric models. It also presents formulas for calculating inequality indices within the κ-generalized framework, including the widely used Gini coefficient and the relatively lesser-known Zanardi index of Lorenz curve asymmetry. Through empirical illustrations, the Element criticizes the conventional application of the Gini index, pointing out its inadequacy in capturing the full spectrum of inequality characteristics. Instead, it advocates the adoption of the Zanardi index, accentuating its ability to capture the inherent heterogeneity and asymmetry in income distributions.