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

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

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")

install.packages("ggplot2") # Install & load ggplot2 library("ggplot2")

ggplot(iris,                     # Create ggplot2 boxplot
       aes(x = Sepal.Length,
           y = Petal.Length,
           fill = Species)) +
  geom_boxplot()

ggplot(iris, # Create ggplot2 boxplot aes(x = Sepal.Length, y = Petal.Length, fill = Species)) + geom_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)

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