R aggregate()

1 개요

R aggregate()

aggregate(Sepal.Length ~ Species, data=iris, sum)
#     Species Sepal.Length
#1     setosa        250.3
#2 versicolor        296.8
#3  virginica        329.4

aggregate(Sepal.Length ~ Species, data=iris, mean)
#     Species Sepal.Length
#1     setosa        5.006
#2 versicolor        5.936
#3  virginica        6.588

aggregate(. ~ Species, data=iris, mean)
#     Species Sepal.Length Sepal.Width Petal.Length Petal.Width
#1     setosa        5.006       3.428        1.462       0.246
#2 versicolor        5.936       2.770        4.260       1.326
#3  virginica        6.588       2.974        5.552       2.026

2 같이 보기

• R apply()
• R lapply()
• R tapply()
• R split()
• aggregate

3 참고

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