Scatterplots in ggplot2
Completion requirements
You will learn the layered syntax of ggplot2 for scatterplots in this section. It also demonstrates how regression lines can be added (compared with the base-R syntax shown in the introductory video).
Scatter plots with the 2d density estimation
The functions geom_density_2d() or stat_density_2d() can be used :
# Scatter plot with the 2d density estimation sp <- ggplot(faithful, aes(x=eruptions, y=waiting)) + geom_point() sp + geom_density_2d() # Gradient color sp + stat_density_2d(aes(fill = ..level..), geom="polygon") # Change the gradient color sp + stat_density_2d(aes(fill = ..level..), geom="polygon")+ scale_fill_gradient(low="blue", high="red")
