Where do data for HDI computation come from?

Life expectancy at birth is provided by the UN Population Division in the UN Department of Economic and Social Affairs (UNDESA); mean years of schooling are based on UNESCO Institute for Statistics (UIS) educational attainment data and, for some countries, Barro and Lee (2013) methodology where UIS data are not available; expected years of schooling is provided by UIS; and GNI per capita (in 2011 $PPP) by the World Bank and the International Monetary Fund. For several countries, mean years of schooling is estimated from nationally representative household surveys and for some countries GNI was obtained from the UN Statistical Division’s database – National Accounts Main Aggregates Database.