The health dimension is assessed by life expectancy at birth, the education dimension is measured by mean of years of schooling for adults aged 25 years and more and expected years of schooling for children of school entering age. The standard of living dimension is measured by gross national income per capita. The HDI uses the logarithm of income, to reflect the diminishing importance of income with increasing GNI. The scores for the three HDI dimension indices are then aggregated into a composite index using geometric mean. Refer to Technical notes for more details.
The Human Development Index ( HDI ) is a composite statistic of life expectancy , education , and per capita income indicators, which are used to rank countries into four tiers of human development . A country scores higher HDI when the lifespan is higher, the education level is higher, and the GDP per capita is higher. The HDI was developed by the Pakistani economist Mahbub ul Haq ,  often framed in terms of whether people are able to "be" and "do" desirable things in their life, and was published by the United Nations Development Programme .
Inequality within countries is a profound challenge to well-functioning societies. The international development community’s latest effort to tackle this challenge is the desire to Leave No One Behind.
This is a list of all the countries by the Human Development Index as included in a United Nations Development Programme 's Human Development Report . The latest report was released on 21 March 2017 and compiled on the basis of estimates for 2015. 
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