Labels and Legends

In this chapter, we discuss annotation of lattice displays by adding labels and legends. As usual, there are various levels of control available to the user, with corresponding differences in the amount of work involved. Most common needs for annotation are satisfied by various labels giving descriptive names for the variables and titles for the entire plot. Legends are usually needed to explain the correspondence between varying graphical parameters such as color, plotting character, and so on, and the quantitative information they represent.