count: Count observations by group

In cobriant/qelp: Quick Help: Beginner friendly help docs for R and the Tidyverse

Count observations by group

Description

Use count() to count the number of occurrences of the unique values of one or more variables in a tibble. count(var) does the same thing as group_by(var) %>% summarize(n = n()).

Usage

count(data, var)

Arguments

data	A tibble
var	The variable you'd like to count() by.

Examples

library(gapminder)

# Count how many observations gapminder
# has for each continent:

count(gapminder, continent)

#> # A tibble: 5 x 2
#>  continent     n
    <fct>     <int>
#> 1 Africa      624
#> 2 Americas    300
#> 3 Asia        396
#> 4 Europe      360
#> 5 Oceania      24

----------------------------------------------------

pets <- tibble(
  names = c("Steve", "Steve", "Rufus", "Sandy", "Sandy"),
  animal = c("dog",  "cat",   "cat",   "dog",   "bird")
  )

# Count the number of pets each person has:

pets %>% count(names)

#> A tibble: 3 x 2
#> names     n
   <chr> <int>
#> 1 Rufus     1
#> 2 Sandy     2
#> 3 Steve     2

# Count the number of animals by type:

pets %>% count(animal)

#> A tibble: 3 x 2
#> animal     n
   <chr>  <int>
#> 1 bird       1
#> 2 cat        2
#> 3 dog        2

cobriant/qelp documentation built on July 1, 2022, 7:24 a.m.