Iris dataset mean() by species

I want to create some mean of sepal.length, but divided by species. Using mosaic package

mean(Sepal.Length~Species)

It didn't work

Solution

A base R solution

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

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