Change Variable Names of Aggregated Data in R (Example Code)

In this tutorial you’ll learn how to change the variable names of an aggregated data frame in the R programming language.

Example Data

data(iris)                                                 # Load 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
iris_aggr1 <- aggregate(list(iris$Sepal.Length),           # Apply aggregate
                        list(iris$Species),
                        mean)
iris_aggr1                                                 # Default column names
#      Group.1 c.5.1..4.9..4.7..4.6..5..5.4..4.6..5..4.4..4.9..5.4..4.8..4.8..
# 1     setosa                                                           5.006
# 2 versicolor                                                           5.936
# 3  virginica                                                           6.588

Example: Set Variable Names within aggregate() Function

iris_aggr2 <- aggregate(list(values = iris$Sepal.Length),  # Set names
                        list(group = iris$Species),
                        mean)
iris_aggr2                                                 # Aggregated data with names
#        group values
# 1     setosa  5.006
# 2 versicolor  5.936
# 3  virginica  6.588

Related Tutorials & Further Resources

In addition, you may want to read the related tutorials which I have published on this homepage.

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