Sebastian Sauer gives us a quick solution to plotting one graph per variable:
Say we have a data frame where we would like to plot each numeric variables’s distribution.
There are a number of good solutions outthere such as this one, or here, or here.
When I read this, my first thought was along the lines of, “Why not use facets or something like cowplot?” But then it clicked that this is per-variable plotting, whereas faceting requires you choose a variable and see the plots based on that variable’s distinct values..