B.8 Transparency using alpha

If there are lots of overlapping points, and we can adjust the transparency using alpha.

First here is a plot using geom_point that has a lot of points plotted on top of one another.

Code

g = ggplot(d, aes(x = hscore, 
                  y = home))+
  geom_point()

g %>% 
  pub(xlim = c(75, 155))

[1] 85.89991
[1] 80
[1] 20
[1] 185.8999

Now we add alpha = 0.5, which means we want points to be halfway between transparent and opaque (1 = opaque, 0 = transparent).

Code

g = ggplot(d, aes(x = hscore, 
                  y = home))+
  geom_point(alpha = 0.5)

g %>% 
  pub(xlim = c(75, 155))

[1] 85.89991
[1] 80
[1] 20
[1] 185.8999