We can use the names() function to see all the variables available to us within the Auto dataset.

> names(Auto)
[1] "mpg"          "cylinders"    "displacement" "horsepower"   "weight"       "acceleration" "year"         "origin"      
[9] "name"   

To refer to a variable, we must type the data set and the variable name joined with a $ symbol.

Auto$cylinders
...

Alternatively, we can use the attach() function in order to tell R to make the variables in this data frame available by name directly.

attach(Auto)
cylinders
...

Question

Try calling the mpg variable of the Auto dataset. Assume that the Auto dataset has been loaded and attached.