How to get summary statistics by group in the R programming language. More details: [ Ссылка ]
R code of this video:

set.seed(549298) # Create example data
data ＜- data.frame(x = rnorm(500, 1, 3),
group = LETTERS[1:5])

summary(data$x) # Summary of entire data

tapply(data$x, data$group, summary) # Summary by group using tapply

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

data %＞% # Summary by group using dplyr
group_by(group) %＞%
summarize(min = min(x),
q1 = quantile(x, 0.25),
median = median(x),
mean = mean(x),
q3 = quantile(x, 0.75),
max = max(x))

install.packages("purrr") # Install & load purrr
library("purrr")

data %＞% # Summary by group using purrr
split(.$group) %＞%
map(summary)

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