Barplot with ggplot2 using data from read.csv2

Question

I am trying to create a barplot with the ggplot2 library. My data is stored in read.csv2 format.

# Library
library(ggplot2)
library(tidyverse) # function "%>%"

# 1. Read data (comma separated)
data = read.csv2(text = "Age;Frequency
0 - 10;1
11 - 20;5
21 - 30;20
31 - 40;13
41 - 49;1")

# 2. Print table
df <- as.data.frame(data)
df

# 3. Plot bar chart
ggplot(df, aes(x = Age)) + 
  geom_bar() + 
  theme_classic()

The code runs fine, but it produces a graph that looks like all data are at max all the time.

bird · Accepted Answer · 2021-05-16 14:45:40Z

3

You need to specify your y axis as well:

ggplot(df, aes(x = Age, y = Frequency)) + 
        geom_bar(stat = "identity") + 
        theme_classic()

answered May 16, 2021 at 14:45

bird

3,3741 gold badge12 silver badges49 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Ronak Shah · Accepted Answer · 2021-05-16 14:46:12Z

1

The default value of geom_bar plots the frequency of the values which is 1 for all the Age values here (Check table(df$Age)). You may use geom_bar with stat = 'identity'

library(ggplot2)

ggplot(df, aes(Age, Frequency)) + 
  geom_bar(stat = 'identity') + 
  theme_classic()

OR geom_col :

ggplot(df, aes(Age, Frequency)) + 
  geom_col() + 
  theme_classic()

answered May 16, 2021 at 14:46

Ronak Shah

391k20 gold badges173 silver badges237 bronze badges

Collectives™ on Stack Overflow

Barplot with ggplot2 using data from read.csv2

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related