CODEWITHSUNDEEP
rplotggplot2
colin
colin

Reputation: 2666

plotting boxplots that sort x axis by y value nested within a category in R

Say I have a dataframe, test:

d1<-c(4.1,4.9,4.5,4.4,1.9,2.1,2.3,1.7,10.1,9.5,10.9,10.3,3.1,3.0,3.2,2.9)
d2<-c('a','a','a','a','b','b','b','b','c','c','c','c','d','d','d','d')
d3<-c(0,0,0,0,1,1,1,1,0,0,0,0,1,1,1,1)
test<-data.frame(d1,d2,d3)

if I make boxplots as a function of d2, I get the following figure:

plot(d1~d2,data=test)

plot 1

However, I would like to change two things about this plot:

(1) I want it to plot the two observations with the value of 0 in d3 to plot first, and those with the value 1 to plot second.

(2) I want it to order the observations within each of these groups by the magnitude of the y value.

The correct final order would be a, c, b, d.

Bonus if you can add colors based on the d3 variable.

Upvotes: 1

Views: 306

Answers (1)

Jaap
Jaap

Reputation: 83225

If I understand you coorectly, you can do this with ggplot2:

library(ggplot2)
ggplot(test, aes(x=reorder(d2,d3), y=d1, fill=factor(d3))) +
  geom_boxplot()

this gives: enter image description here

You can do the same tric in base R:

plot(d1~reorder(d2,d3),data=test)

Upvotes: 1

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