Adding some jitter

We can improve the previous plot by adding jittered points behind the boxplot. Make the jittered points a nice 'steelblue' color and set their alpha to 0.3 in order to visualize any overlap that may happen by chance.

You will also need to make the boxplot transparent in order to see the points that fall under the 'box' of the box plot.

Cet exercice fait partie du cours

Visualization Best Practices in R

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Instructions

Add geom_jitter() to the plot object before the boxplot geometry.
Set the color of the jittered points to 'steelblue' and the alpha to 0.3.
Make existing boxplot transparent by setting alpha to 0.

Exercice interactif pratique

Essayez cet exercice en complétant cet exemple de code.

md_speeding %>% 
    filter(vehicle_color == 'RED') %>%
    ggplot(aes(x = gender, y = speed)) + 
    # add jittered points with alpha of 0.3 and color 'steelblue'
    ___ +
    # make boxplot transparent with alpha = 0
    geom_boxplot(___) +
    labs(title = 'Speed of red cars by gender of driver')

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