The Human Development Index (HDI) is an index used to rank countries by level of "human development", which usually also implies to determine whether a country is a developed, developing, or underdeveloped country.
The HDI combines three basic dimensions:
- Life expectancy at birth, as an index of population health and longevity
- Knowledge and education, as measured by the adult literacy rate (with two-thirds weighting) and the combined primary, secondary, and tertiary gross enrollment ratio (with one-third weighting).
- Standard of living, as measured by the natural logarithm of gross domestic product (GDP) per capita at purchasing power parity (PPP) in United States dollars.
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