Technical notes

The HDI includes three key components-longevity, knowledge and income, which are combined to arrive at an average deprivation index (for a full technical description, see Human Development Report 1991, technical note 1, pp. 88–89). Longevity is measured by life expectancy at birth as the sole unadjusted indicator. Knowledge is measured by two educational stock variables: adult literacy and mean years of schooling. The measure of educational achievement is adjusted by assigning a weight of two-thirds to literacy and one-third to mean years of schooling

Related Subject(s): Economic and Social Development