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