A marginal plot is a graph that you can use to assess the relationship between two variables and examine their distributions. A marginal plot is a scatterplot with histograms, boxplots, or dotplots of the x and y variables in the margins. This two-in-one graph lets you compare individual variables and their distributions at the same time. The type of marginal plot you choose depends on how you prefer to view distributions.
The following marginal plots show the relationship between the flash recovery time of cameras (minimum time between flashes) and the voltage remaining in the camera batteries.