Faceting in ggplot2 is one of the most powerful ways to create small multiples—a series of plots split by a grouping variable. With facet_wrap() and facet_grid(), you can easily compare distributions, trends, or relationships across categories. New to facets? Start here: How to make a facet plot using facet_wrap(). By default, each facet panel comes… Continue reading How To Customize Border in facet in ggplot2