Andrew Heiss • 2/19/2025

How to use a histogram as a legend in {ggplot2}

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This technical tutorial demonstrates how to programmatically create a choropleth map with an integrated histogram legend using R, ggplot2, the sf package for spatial data, and patchwork for layout. It addresses the visual distortion in maps caused by varying geographic unit sizes and shows how a histogram legend provides clearer context for data distribution, such as unemployment rates.

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#data visualization #Ggplot2 #R
How to use a histogram as a legend in {ggplot2}

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