Here's a sample of my data df
group score1 score2
a 12 15
a 11 14
a 24 22
b 34 24
b 14 23
b 33 44
c 11 22
c 23 34
c 32 43
...
I know how to use ggplot2 to make a boxplot comparing group with score1 and another boxplot comparing group with score2.
But how do I make one boxplot where X axis is group, with boxes for both score1 and score2?
I believe this is probably what you're getting at -- first you might want to consider tidying the dataset with tidyr, then you can make the plot using a call to interaction():
library(ggplot2)
library(tidyr)
df <- gather(df, score, value, -group)
head(df)
# group score value
# 1 a score1 12
# 2 a score1 11
# 3 a score1 24
# 4 b score1 34
# 5 b score1 14
# 6 b score1 33
ggplot(df, aes(x = interaction(score, group), y = value)) +
geom_boxplot()
As an alternative, you could pass the new score variable to a color aesthetic to get something like this:
