Ridgeline plot or Joyplot shows the distribution of a numeric value for several groups. They can be quite useful for visualizing changes in distributions over time or space. Distribution can be represented using histograms or

density plots, all aligned to the same horizontal scale and presented with a slight overlap. Joyplots are especially interesting when the number of group to represent is high, and thus a classic window separation would take

to much place. However be always careful since it hides a part of the data where the overlap takes place. In R, Ridgeline plots can easily be done thanks to the ggridges library by Claus Wilke which is a ggplot2 extension.

 

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