نوع مقاله : مقاله پژوهشی
نویسنده
استادیار گروه آمار، دانشکده علوم پایه، دانشگاه پیام نور، تهران، ایران
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسنده [English]
This study presents a new index for measuring income inequality based on the ratio of the median income of low-income to high-income groups. Given the common challenges in income data, including the presence of outliers and asymmetric distributions, conventional mean-based indices often do not provide appropriate estimates. In contrast, the proposed index, by utilizing the median—a measure robust to outliers—mitigates this challenge. By precisely defining the new index and introducing the related “inequality curve,” the present study examines the basic features of a valid inequality measure and provides a consistent estimator for it. The performance of the index has been evaluated through simulation studies and application to Iranian household income data. The findings indicate that the proposed index is not only a valid measure for measuring inequality, but also provides a more expressive and practical understanding of the Lorenz curve through the related curve.
کلیدواژهها [English]
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