How to plot boxplot in R?
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How to plot boxplot in R?

How to plot boxplot in R?

This recipe helps you plot boxplot in R

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Recipe Objective

Box-plots are also known as box-whisker plots. They are a special type of plot which showcases complex numerical data in a compact manner. It is more informative than a strip chart as it also displays the interquartile range, median and min-max range. It is mainly used to find outliers in the dataset. ​

In this recipe we are going to use ggplot2 package to plot the required box plot. ggplot2 package is based on the book Grammar of Graphics by Wilkinson. This package provides flexibility while incorporating different themes and plot specification with a high level of abstraction. The package mainly uses aesthetic mapping and geometric objects as arguments. Different types of geometric objects include: ​

  1. geom_point() - for plotting points
  2. geom_bar() - for plotting bar graph
  3. geom_line() - for plotting line chart
  4. geom_boxplot() - for plotting boxplot

The basic syntax of gggplot2 plots is: ​

ggplot(data, mapping = aes(x =, y=)) + geometric object ​

where: ​

  1. data : Dataframe that is used to plot the chart
  2. mapping = aes() : aesthetic mapping which deals with controlling axis (x and y indicates the different variables)
  3. geometric object : Indicates the code for typeof plot you need to visualise.

This recipe demonstrates how to make a violin plot using ggplot2.

STEP 1: Loading required library and dataset

Dataset description: It is the basic data about the customers going to the supermarket mall. The variable that we interested in is Annual.Income which is in 1000s

# Data manipulation package library(tidyverse) ​ # ggplot for data visualisation library(ggplot2) ​ # reading a dataset customer_seg = read.csv('Mall_Customers.csv') ​ glimpse(customer_seg)
Rows: 200
Columns: 5
$ CustomerID              1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 1...
$ Gender                  Male, Male, Female, Female, Female, Female, ...
$ Age                     19, 21, 20, 23, 31, 22, 35, 23, 64, 30, 67, ...
$ Annual.Income..k..      15, 15, 16, 16, 17, 17, 18, 18, 19, 19, 19, ...
$ Spending.Score..1.100.  39, 81, 6, 77, 40, 76, 6, 94, 3, 72, 14, 99,...

STEP 2: Plotting a Box plot using ggplot

We use geometric object as geom_boxplot() to plot a boxplot of Annual Income variable based on the gender

Note:

  1. The + sign in the syntax earlier makes the code more readable and enables R to read further code without breaking it.
  2. fill arguement inside the geom_violin() o fill the violinplot based on a factor
  3. We also use labs() function to give a title to the graph
ggplot(customer_seg, aes(x = Gender, y = Annual.Income..k..)) + geom_boxplot(aes(fill = Gender)) + labs(title = "Annual Income Box Plot")

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