Grouping data points within a scatter plot
A basic scatter plot has a set of points plotted at the intersection of their values along x and y axes. Sometimes, we might wish to further distinguish between these points based on another value associated with the points. In this recipe, we will learn how we can group data points using colors.
Getting ready
To try out this recipe, start R and type the recipe in the command prompt. You can also choose to save the recipe as a script so that you can use it again later on.
We will also need the lattice and ggplot2 packages. The lattice package is included automatically in the base R installation, but we will need to install the ggplot2 package. To do this, run the following command in the R prompt:
install.packages("ggplot2") ...Get R: Data Analysis and Visualization now with the O’Reilly learning platform.
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