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Inequality-adjusted Human Development Index (IHDI)

IHDI adjusts the Human Development Index (HDI) for inequality in the distribution of each dimension across the population.

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IHDI is based on a distribution-sensitive class of composite indices proposed by Foster, Lopez-Calva and Szekely (2005), which draws on the Atkinson (1970) family of inequality measures. It is computed as a geometric mean of inequality-adjusted dimensional indices. The IHDI accounts for inequalities in HDI dimensions by “discounting” each dimension’s average value according to its level of inequality. The IHDI value equals the HDI value when there is no inequality across people but falls below the HDI value as inequality rises. In this sense, the IHDI measures the level of human development when inequality is accounted for.