How to Create a Table by Group in R (Example Code)

In this tutorial, I’ll illustrate how to create a table with groups in the R programming language.

Creation of 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

Example: Creating a Table with Groups

table(iris$Sepal.Length,        # Make table by group
      iris$Species)
#      
#       setosa versicolor virginica
#   4.3      1          0         0
#   4.4      3          0         0
#   4.5      1          0         0
#   4.6      4          0         0
#   4.7      2          0         0
#   4.8      5          0         0
#   4.9      4          1         1
#   5        8          2         0
#   5.1      8          1         0
#   5.2      3          1         0
#   5.3      1          0         0
#   5.4      5          1         0
#   5.5      2          5         0
#   5.6      0          5         1
#   5.7      2          5         1
#   5.8      1          3         3
#   5.9      0          2         1
#   6        0          4         2
#   6.1      0          4         2
#   6.2      0          2         2
#   6.3      0          3         6
#   6.4      0          2         5
#   6.5      0          1         4
#   6.6      0          2         0
#   6.7      0          3         5
#   6.8      0          1         2
#   6.9      0          1         3
#   7        0          1         0
#   7.1      0          0         1
#   7.2      0          0         3
#   7.3      0          0         1
#   7.4      0          0         1
#   7.6      0          0         1
#   7.7      0          0         4
#   7.9      0          0         1

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