More on the Grammar of Graphics

The Grammar of Graphics is the language used to describe the various components of a graphic that represent data in a visualization. In this topic, you will learn more about the Grammar of Graphics and will use it to make plots. You will e-encounter some of the Grammar of Graphics terms used in the previous chapter.

We will now break down the Grammar of Graphics language, in order to understand the terms in greater detail. 

Layers

In ggplot2, every plot is built up as a layer. Layers are made up of geometric objects (geoms), their statistical transformations (stats), and their thematic aspects. Hence, each plot can be thought of as a separate variable, in and of itself. Aesthetic...