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 ellipses
The function stat_ellipse() can be used as follow:
# One ellipse arround all points ggplot(faithful, aes(waiting, eruptions))+ geom_point()+ stat_ellipse() # Ellipse by groups p <- ggplot(faithful, aes(waiting, eruptions, color = eruptions > 3))+ geom_point() p + stat_ellipse() # Change the type of ellipses: possible values are "t", "norm", "euclid" p + stat_ellipse(type = "norm")
