Mean by Group in R (2 Examples) | dplyr Package vs. Base R | group_by() & summarise_at() Functions

How to compute the mean by group in the R programming language. More details: https://statisticsglobe.com/mean-by-g...
R code of this video:

data(iris) # Load Iris data
head(iris) # First rows of Iris

aggregate(x = iris$Sepal.Length, # Specify data column
by = list(iris$Species), # Specify group indicator
FUN = mean) # Specify function (i.e. mean)

install.packages("dplyr") # Install dplyr package
library("dplyr") # Load dplyr package

iris %＞% # Specify data frame
group_by(Species) %＞% # Specify group indicator
summarise_at(vars(Sepal.Length), mean) # Specify column & function

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