Quarto Computations

This dataset contains a subset of the fuel economy data from the EPA. Specifically, we use the mpg dataset from the ggplot2 package.

The plots in Figure 1 show the relationship between city and highway mileage for 38 popular models of cars. In Figure 1 (a) the points are colored by the number of cylinders while in Figure 1 (b) the points are colored by engine displacement.

ggplot(mpg, aes(x = hwy, y = cty, color = cyl)) +
  geom_point(alpha = 0.5, size = 2) +
  scale_color_viridis_c() +
  theme_minimal()

ggplot(mpg, aes(x = hwy, y = cty, color = displ)) +
  geom_point(alpha = 0.5, size = 2) +
  scale_color_viridis_c(option = "E") +
  theme_minimal()

(a) Color by number of cylinders

(b) Color by engine displacement, in liters

Figure 1: City and highway mileage for 38 popular models of cars.