12) ggplot

📖 Lecture

Simply put: a graphic involves mapping data to geometric objects and their visual attributes. This is the underlying framework behind the mechanics and core functions available in "ggplot2" for creating simple graphics:

• Begin your graphic specification with ggplot()
• Indicate where the data comes from
• Establish which variables are going to be mapped into visual attributes: aes()
• Decide what kind of geometric object(s) will be used to display data; e.g. geom_point()
• Optional: do you need to use facets?
• Optional: do you need to explicitly use one or more statistical transformations?
• Optional: do you need to explicitly set a non-default system of coordinates?
• Optional: do you need to explicitly use a non-default theme of graphical elements?

🎯 Objectives

At the end of this week you will be able to:

• Get a first contact with "ggplot2"
• Describe the purpose of the aesthetic mapping function aes()
• Describe the notion of “layers” and how to use them for making a graphic using "ggplot2"

📚 Reading

• https://www.gastonsanchez.com/R-tidy-hurricanes/2-01-intro-ggplot.html

• https://www.gastonsanchez.com/R-tidy-hurricanes/3-02-storms-1975.html

🔬 Lab

You’ll learn how to create basic graphics with ggplot2 functions.