ggMarginal() is an easy drop-in solution for adding marginal density plots/histograms/boxplots to a ggplot2 scatterplot. The easiest way to use it is by simply passing it a ggplot2 scatter plot, and ...

I want to keep the graph with frequency/counts, but I want to add a curve representing an ideal normal distribution for each variable. I found a useful post here for a single variable/graph. I have ...

There’s a reason ggplot2 is one of the most popular add-on packages for R: ... bar graph, histogram, etc. For that you need layer 2: a geometry, or geom in gpplot-speak.