df$cyl <- as.factor(df$cyl)
head(df)
## mpg cyl wt
## Mazda RX4 21.0 6 2.620
## Mazda RX4 Wag 21.0 6 2.875
## Datsun 710 22.8 4 2.320
## Hornet 4 Drive 21.4 6 3.215
## Hornet Sportabout 18.7 8 3.440
## Valiant 18.1 6 3.460
ggplot(df, aes(x=wt, y=mpg)) +
geom_point(size=1.5)
6.2 Add regression lines and change the point colors, shapes and sizes
ggplot(df, aes(x=wt, y=mpg, color=cyl, shape=cyl)) +
geom_point(size=1.5) +
geom_smooth(method=lm, se=FALSE, fullrange=TRUE) +
theme_classic()
