Human development index is calculated by taking three factors into account: a decent standard of living, a long and healthy life, and access to knowledge. When calculating a decent standard of living, the UN uses a lot of data about the country. This data includes gross national income (GNI) and purchasing power parity (PPP). They also measure the productivity of workers, inequality-adjusted HDI, and consumer goods. When calculating a long and healthy life, the UN looks at life expectancy and infant mortality. When calculating access to knowledge, the UN measures the years of schooling the average person 25 or older has received in that country. They also look at the expected years of schooling (the number of years the average 5-year old will spend being schooled). I really hope this helps! Feel free to rate my answer as well c:
