Introduction to ggplot2 Package in R | Data Visualization Tutorial for Beginners & Advanced Examples

Published: 04 May 2023
on channel: Statistics Globe

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How to draw graphics using the ggplot2 package in the R programming language. More details: https://statisticsglobe.com/ggplot2-r...

Table of contents:

00:00 - Introduction
00:42 - Grammar of Graphics & ggplot2 Layers
02:02 - Basic Application of ggplot2 Package
13:24 - Advanced Data Visualization
33:04 - Outro

R code of this video:

data ＜- data.frame(x = 1:9, # Create simple example data
y = c(3, 1, 4,
3, 5, 2,
1, 2, 3),
group = rep(LETTERS[1:3], each = 3))
data # Print example data

install.packages("ggplot2") # Install ggplot2 package
library("ggplot2") # Load ggplot2

ggplot(data, # Draw basic ggplot2 scatterplot
aes(x = x,
y = y)) +
geom_point()

ggplot(data, # Increase point size
aes(x = x,
y = y)) +
geom_point(size = 3)

ggplot(data, # Set colors by groups
aes(x = x,
y = y,
col = group)) +
geom_point(size = 3)

ggp_simple ＜- ggplot(data, # Store ggplot2 plot in data object
aes(x = x,
y = y,
col = group)) +
geom_point(size = 3)

ggp_simple + # Change x-axis limits
scale_x_continuous(limits = c(- 3, 15))

ggp_simple + # Change colors by groups
scale_color_manual(breaks = c("A", "B", "C"),
values = c("#1b98e0", "#353436", "#e32f08"))

ggp_simple + # Add multiple scale layers
scale_x_continuous(limits = c(- 3, 15)) +
scale_color_manual(breaks = c("A", "B", "C"),
values = c("#1b98e0", "#353436", "#e32f08"))

ggp_simple + # Create subplots using facet_wrap()
scale_x_continuous(limits = c(- 3, 15)) +
scale_color_manual(breaks = c("A", "B", "C"),
values = c("#1b98e0", "#353436", "#e32f08")) +
facet_wrap(group ~ .)

ggp_simple + # Change ggplot2 theme
scale_x_continuous(limits = c(- 3, 15)) +
scale_color_manual(breaks = c("A", "B", "C"),
values = c("#1b98e0", "#353436", "#e32f08")) +
facet_wrap(group ~ .) +
theme_bw()

ggp_simple + # Remove legend from plot
scale_x_continuous(limits = c(- 3, 15)) +
scale_color_manual(breaks = c("A", "B", "C"),
values = c("#1b98e0", "#353436", "#e32f08")) +
facet_wrap(group ~ .) +
theme_bw() +
theme(legend.position = "none")

ggp_simple + # Remove axis information
scale_x_continuous(limits = c(- 3, 15)) +
scale_color_manual(breaks = c("A", "B", "C"),
values = c("#1b98e0", "#353436", "#e32f08")) +
facet_wrap(group ~ .) +
theme_bw() +
theme(legend.position = "none",
axis.title.x = element_blank(),
axis.text.x = element_blank(),
axis.ticks.x = element_blank(),
axis.title.y = element_blank(),
axis.text.y = element_blank(),
axis.ticks.y = element_blank())

Please find the code for the advanced examples on the website: https://statisticsglobe.com/ggplot2-r...

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