Welcome in the ridgeline chart section of the gallery. Sometimes called joyplot, this kind of chart allows to visualize the distribution of several numeric variables, as stated in data-to-viz.com. Here are several examples implemented using R
and the ridgelines
R package
ggridges
package.In term of code, a ridgeline chart is simply a set of many density plots. Thus, starting by learning the basics of density chart is probably a good idea.