Scatterplots are great for visualizing relationship between two quantitative variables. However, it suffers from overplotting when the number of data points is large. Another solution is plot the density instead of actjual points. However, sometimes you might want to see the datapoints. ggpointdensity is a ggplot2 extension that solves the problem by combining scatterplot with… Continue reading ggpointdensity plot: A ggplot extension combining scatter plot with density plot