ggplot2 Facet Boxplot for Groups of Continuous Variable in R (Example Code)

On this page you’ll learn how to split a continuous variable into boxplot-groups in the R programming language.

Preparing the Example

data(iris)                       # Example data
head(iris)
#   Sepal.Length Sepal.Width Petal.Length Petal.Width Species
# 1          5.1         3.5          1.4         0.2  setosa
# 2          4.9         3.0          1.4         0.2  setosa
# 3          4.7         3.2          1.3         0.2  setosa
# 4          4.6         3.1          1.5         0.2  setosa
# 5          5.0         3.6          1.4         0.2  setosa
# 6          5.4         3.9          1.7         0.4  setosa
install.packages("ggplot2")      # Install & load ggplot2
library("ggplot2")
ggplot(iris,                     # Create ggplot2 boxplot
       aes(x = Sepal.Length,
           y = Petal.Length,
           fill = Species)) +
  geom_boxplot()

r graph figure 1 ggplot2 facet boxplot for groups continuous variable r

Example: Cutting Continuous Variable into Groups in Boxplot

ggplot(iris,                     # ggplot2 boxplot with multiple groups
       aes(x = cut_width(Sepal.Length, 1),
           y = Petal.Length,
           fill = Species)) +
  geom_boxplot() +
  facet_grid(. ~ Species)

r graph figure 2 ggplot2 facet boxplot for groups continuous variable r

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