The 2018 Legatum Prosperity Index is based on 104 different variables analysed across 149 nations around the world. Source data includes Gallup World Poll, World Development Indicators, International Telecommunication Union, Fragile States Index, Worldwide Governance Indicators, Freedom House, World Health Organization, World Values Survey, Amnesty International, Centre for Systemic Peace. The 104 variables are grouped into 9 sub-indexes, which are averaged using equal weights.