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.

Deze oefening maakt deel uit van de cursus

Visualization Best Practices in R

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Oefeninstructies

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.

Praktische interactieve oefening

Probeer deze oefening eens door deze voorbeeldcode in te vullen.

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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