6.Scatter plots

6.1 Basic scatter plots

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()

Reference: http://www.sthda.com/english/wiki/ggplot2-scatter-plots-quick-start-guide-r-software-and-data-visualization