Visualization of several United Nations indices on education, income, and health. I’m not quite sure what the point of using a “tree” is, but they obviously put some thought into it: The height of the tree trunk is proportional to the total value of the HDI. The size of the three branches are proportional to each sub-indicator. The branches are ordered in increasing order from left to right. The color of the trunk is the average of the color of the components.
Here’s a tree “legend”:
and a comparison of the United States and China:
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