Let’s Plot 5: ridgeline density plots

Intro For this installment of Let’s Plot (where anyone can make a figure!), we’ll be making the hottest visualization of 2017 - the joy plot or ridgeline plot. Joy plots are partially overlapping density line plots. They are useful for densely showing changes in many distributions over time / condition / etc. This type of visualization was inspired by the cover art from Joy Division’s album Unknown Pleasures and implemented in the R package ggridges by Claus Wilke.