Error Bars using ggplot2 in R

Pie Charts in R using ggplot2

Last Updated : 25 Feb, 2021

A Pie Chart or Circle Chart is a circular statistical graphical technique that divides the circle in numeric proportion to represent data as a part of the whole. In Circle Chart the arc length of each slice is proportional to the quantity it represents. Pie charts are very widely used in the business world and the mass media to understand trends.

Approach

Import module
Create data
Arrange the rows of a data frame by the values of selected columns.
Mutate to create a new variable from a data set
Plot pie chart
Display plot

Example 1:

R

library(ggplot2)
library(dplyr)

count.data <- data.frame(
    pilot_class = c("A++(Senior pilot)", "A+(Junior pilot)", "A-(Trainee pilot)", "Crew"),
    n = c(389, 256, 589, 466),
    proportion = c(22.88, 15.0588, 34.647, 27.411)
)

count.data

count.data <- count.data %>%
    arrange(desc(pilot_class)) %>%
    mutate(lab.ypos = cumsum(proportion) - 0.6*proportion)

count.data

mycols <- c("#42f55a", "#42f5e6", "#ecf542", "#f56f42")

ggplot(count.data, aes(x = "", y = proportion, fill = pilot_class)) +
    geom_bar(width = 1, stat = "identity", color = "black") +
    coord_polar("y", start = 0)+
    geom_text(aes(y = lab.ypos, label = proportion), color = "black")+
    scale_fill_manual(values = mycols) +
    theme_void()

Output:

Example 2:

R

Name_of_student <- c("Ankit", "Jack", "Prakhar", "Madahav", "shef", 
            "sama", "karthik", "Ritwik", "Agnim", "Harsh")

contribution_in_project <- c(.103, .097, .103, .103,.097, .097, .10,.10,.10,.10 )

top_ten_contributors <- data.frame(Name_of_student,contribution_in_project)
top_ten_contributors

pie_2 <- ggplot(top_ten_contributors, aes(x = factor(1), fill = factor(contribution_in_project))) +
    geom_bar(width = 1)

pie_2 + coord_polar(theta = "y")

Output:

Error Bars using ggplot2 in R

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