Where do data for HDI computation come from?

Life expectancy at birth is provided by the UN Department of Economic and Social Affairs – the UN Population Division; mean years of schooling are based on UNESCO Institute for Statistics (UIS) educational attainment data and Barro and Lee (2013) methodology; expected years of schooling are provided by UIS; and GNI per capita in 2011 PPP by the World Bank and the International Monetary Fund. For a few countries, mean years of schooling is estimated from nationally representative household surveys and for a few countries GNI was obtained from the UN Statistical Division’s database with the SNA Main Aggregates.