3 Different ways to make bar plots with ggplot2

In this post, we will see three different ways to make a barplot with count on y-axis in ggplot2. We will show how to make bar plot using geom_bar(), stat_count(), and geom_col() functions available in ggplot2

library(tidyverse)
theme_set(theme_bw(16))

mpg |> head()

# A tibble: 6 × 11
  manufacturer model displ  year   cyl trans      drv     cty   hwy fl    class 
  <chr>        <chr> <dbl> <int> <int> <chr>      <chr> <int> <int> <chr> <chr> 
1 audi         a4      1.8  1999     4 auto(l5)   f        18    29 p     compa…
2 audi         a4      1.8  1999     4 manual(m5) f        21    29 p     compa…
3 audi         a4      2    2008     4 manual(m6) f        20    31 p     compa…
4 audi         a4      2    2008     4 auto(av)   f        21    30 p     compa…
5 audi         a4      2.8  1999     6 auto(l5)   f        16    26 p     compa…
6 audi         a4      2.8  1999     6 manual(m5) f        18    26 p     compa…

Bar plot with geom_bar()

mpg |>
  ggplot(aes(x=class))+
  geom_bar()

Bar plot with stat_count()

mpg |>
  ggplot(aes(x=class))+
  stat_count(geom="bar")

Bar plot with geom_col()

mpg |>
  count(class) |>
  ggplot(aes(x=class, y =n))+
  geom_col()