How to create a grouped boxplot in R?

Question

I want to merge the three datasets grouped and obtain a graph with only two boxes, 1 for A and 1 for B. Can you suggest how to get that?

I\'m tryng to create a group

Answer 1

You should use ggplot2

ggplot() + 
  geom_boxplot(data = df, mapping = aes(col_name, value, fill=index))  + 
  theme( axis.text.x = element_blank()) +
  geom_segment(data=hline1, mapping=aes(x=1, y=-0.5, xend=3, yend=-0.5), size=2) +
  annotate("text", x = 2, y = -1, label = "A") + 
  geom_segment(data=hline1, mapping=aes(x=4, y=-0.5, xend=6, yend=-0.5), size=2) +
  annotate("text", x = 5, y = -1, label = "B")