The ggplot2 package is a powerful tool for creating high-quality graphics in R. It is based on the grammar of graphics, which provides a systematic way to build plots. This tutorial provides an introduction to ggplot2, covering the basics of creating plots, customizing their appearance, and saving them to files.
Which of the following is not a layer in ggplot2?
Which of the following is not a valid theme in ggplot2?
What is the default color palette used in ggplot2?