Change Spaces Between Grouped Boxplots in R (2 Examples)

data(iris)                           # Example data
iris_new <- iris
iris_new$new <- letters[1:2]
head(iris_new)
#   Sepal.Length Sepal.Width Petal.Length Petal.Width Species new
# 1          5.1         3.5          1.4         0.2  setosa   a
# 2          4.9         3.0          1.4         0.2  setosa   b
# 3          4.7         3.2          1.3         0.2  setosa   a
# 4          4.6         3.1          1.5         0.2  setosa   b
# 5          5.0         3.6          1.4         0.2  setosa   a
# 6          5.4         3.9          1.7         0.4  setosa   b

data(iris) # Example data iris_new <- iris iris_new$new <- letters[1:2] head(iris_new) # Sepal.Length Sepal.Width Petal.Length Petal.Width Species new # 1 5.1 3.5 1.4 0.2 setosa a # 2 4.9 3.0 1.4 0.2 setosa b # 3 4.7 3.2 1.3 0.2 setosa a # 4 4.6 3.1 1.5 0.2 setosa b # 5 5.0 3.6 1.4 0.2 setosa a # 6 5.4 3.9 1.7 0.4 setosa b

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

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

ggplot(iris_new,                     # Default ggplot2 boxplot
       aes(x = Species,
           y = Sepal.Length,
           fill = new)) +
  geom_boxplot()

ggplot(iris_new, # Default ggplot2 boxplot aes(x = Species, y = Sepal.Length, fill = new)) + geom_boxplot()

ggplot(iris_new,                     # Equal space
       aes(x = Species,
           y = Sepal.Length,
           fill = new)) +
  geom_boxplot(position = position_dodge(1))

ggplot(iris_new, # Equal space aes(x = Species, y = Sepal.Length, fill = new)) + geom_boxplot(position = position_dodge(1))

ggplot(iris_new,                     # No space
       aes(x = Species,
           y = Sepal.Length,
           fill = new)) +
  geom_boxplot(position = "dodge")

ggplot(iris_new, # No space aes(x = Species, y = Sepal.Length, fill = new)) + geom_boxplot(position = "dodge")