R aggregate()

1 개요

R aggregate()

R

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aggregate(Sepal.Length ~ Species, data=iris, mean)
#     Species Sepal.Length
#1     setosa        5.006
#2 versicolor        5.936
#3  virginica        6.588
aggregate(Sepal.Length ~ Species, data=iris, sum)
#     Species Sepal.Length
#1     setosa        250.3
#2 versicolor        296.8
#3  virginica        329.4
aggregate(. ~ Species, data=iris, sum)
#     Species Sepal.Length Sepal.Width Petal.Length Petal.Width
#1     setosa        250.3       171.4         73.1        12.3
#2 versicolor        296.8       138.5        213.0        66.3
#3  virginica        329.4       148.7        277.6       101.3

2 같이 보기

• R apply()
• R lapply()
• R tapply()

3 참고

• https://www.rdocumentation.org/packages/stats/versions/3.5.3/topics/aggregate