Coloring specific points in Ggplot - R

Question

I’m doing a graphical analysis of the package data gapminder. Soon, I made the following code:

library('gapminder')
dados6 <- gapminder

ggplot(gapminder, aes(x = continent, y = lifeExp)) +
  geom_boxplot(outlier.colour = "hotpink") +
  geom_jitter(position = position_jitter(width = 0.1, height = 0), alpha = 1/4)

In which produced the chart below:

However, I want to color with green the points referring to Brazil.
How can I do that?

Sincerely yours.

Answer 1

You can do it with one more geom_, to geom_point. However, to have only the points referring to Brazil, you have to select a subset of the data, in this case with subset.

library(tidyverse)
library(ggplot2)
library('gapminder')


gapminder %>%
  group_by(continent) %>%
  mutate(ymax = quantile(lifeExp, 3/4) + IQR(lifeExp),
         ymin = quantile(lifeExp, 1/4) - IQR(lifeExp),
         out = lifeExp < ymin | lifeExp > ymax) %>%
  ggplot(aes(x = continent, y = lifeExp)) +
  geom_boxplot(outlier.colour = "hotpink") +
  geom_jitter(aes(y = ifelse(out, NA, lifeExp)),
              position = position_jitter(width = 0.1, height = 0), alpha = 1/4) +
  geom_point(data = subset(gapminder, country == 'Brazil'),
             aes(x = continent, y = lifeExp),
             position = position_jitter(width = 0.1),
             colour = "green", alpha = 1/2)