HDI revisited The United Nations Development Programme (UNDP) uses the Human Development Index (HDI) in an attempt to summarize in one number the progress in health, education, and economics of a...

HDI revisited The United Nations Development Programme (UNDP) uses the Human Development Index (HDI) in an attempt to summarize in one number the progress in health, education, and economics of a country. The number of phone subscribers per 100 people is positively associated with economic progress in a country. Can the number of phone subscribers be used to predict the HDI? Here is a scatterplot of HDI against phone subscribers: