Exercise 1. ggplot2 basics

Start by loading the dplyr and ggplot2 libraries as well as the murders data.

library(dplyr)
library(ggplot2)
library(dslabs)
data(murders)

Note that you can load both dplyr and ggplot2, as well as other packages, by installing and loading the tidyverse package.

With ggplot2 plots can be saved as objects. For example we can associate a dataset with a plot object like this

p <- ggplot(data = murders)

Because data is the first argument we don't need to spell it out. So we can write this instead:

p <- ggplot(murders)

or, if we load dplyr, we can use the pipe:

p <- murders %>% ggplot()

Remember the pipe sends the object on the left of %>% to be the first argument for the function the right of %>%.

Now let's get an introduction to ggplot.

What is the class of the object p?