Example of a chart showing data with “heavy-tail” distribution

Line chart showing the distribution of census tract Road Terrain Ruggedness Index values in which low-frequency tracts still tend to have high impact.

The intersection of rugged terrain and economic activity remains understudied, so USDA, Economic Research Service researchers developed two classifications of U.S. census tracts: the six-level Area Ruggedness Scale and the five-level Road Ruggedness Scale.

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