What does the Coefficient of Human Inequality measure?

The Coefficient of Human Inequality, introduced in the 2014 HDR as an experimental measure, is a simple average of inequalities in health, education and income. The average is calculated by an unweighted arithmetic mean of estimated inequalities in these dimensions. When all inequalities are of a similar magnitude, the coefficient of human inequality and the loss in HDI differ negligibly, when inequalities differ in magnitude, the loss in HDI tends to be higher than the coefficient of human inequality.