| The scores for the three HDI dimension indices are then aggregated into a composite index using geometric mean. |
| The UNDP puts countries into three categories based on their HDI number: low, medium, and high human development. |
| The geometric mean has only a moderate impact on HDI rankings. |
| All but five of the 45 countries that most improved their HDI scores also increased the share of trade in their economies, often dramatically. |
| Let us recall that the HDI is an index made of criteria relating to health, level of education and longevity. |
| A country scores higher HDI when the life expectancy at birth is longer, the education period is longer, and the income per capita is higher. |
