What are the components of the HDI?

The components of the Human Development Index (HDI) are:

1. Life expectancy at birth: This component measures the average number of years a person is expected to live from birth. It reflects the overall health and well-being of a population.

2. Education: The education component is measured by two indicators: mean years of schooling and expected years of schooling. Mean years of schooling represents the average number of years of education received by adults aged 25 and older, while expected years of schooling represents the number of years a child of school entrance age is expected to receive.

3. Gross national income (GNI) per capita: This component measures the average income per person in a country, taking into account the purchasing power parity (PPP) to account for differences in the cost of living between countries.

These three components are combined to calculate the HDI, which provides a comprehensive measure of a country's overall development and standard of living.