Inequalityadjusted

Inequalityadjusted is an adjective used for indicators that modify a baseline measure to reflect how outcomes are distributed across a population. It is commonly applied in development economics and public health to capture not just the average level of achievement but also the equity of its distribution.

A well-known example is the inequality-adjusted Human Development Index (IHDI). The IHDI adjusts the standard Human Development Index by incorporating inequality in health, education, and standard of living. If there is perfect equality, the IHDI equals the HDI; as inequality increases, the IHDI falls. The IHDI provides a more inequality-aware view of development progress and is used by the United Nations Development Programme in its annual Human Development Reports.

Inequality adjustment is also used in other domains, such as inequality-adjusted life expectancy, which seeks to reflect disparities in health or mortality when summarizing life expectancy, and in various domain-specific measures that penalize unequal outcomes within a population.

Methodologically, inequality adjustment generally requires distributional data and an inequality metric (for example, the Gini coefficient, Theil index, or concentration indices). The resulting adjusted index aims to balance attention between mean levels and the fairness of their distribution, aiding policy analysis that targets both overall improvement and equity.

Limitations include data intensity, methodological complexity, and sensitivity to the choice of inequality measure and decomposition method. See also Human Development Index, IHDI, Gini coefficient.