Issue
I want to have multiple pie charts per column and across two groups.
My data looks like this:
mydf <- data.frame(ID, age, gender, diagnosis, A1, A2, A3)
mydf
ID age gender diagnosis A1 A2 A3
a 22 female 1 A D B
b 34 male 2 B E NA
c 55 female 2 C B A
d 55 female 1 NA A B
e 45 male 1 E D B
here A1, A2, and A3 refer to the questions in the test I applied to participants and the letters below represent the answer chosen by the participant. So, it is a categorical value. Diagnosis 1 and 2 refer to whether the participant is diagnosed or not with the illness.
I want to calculate the percentage-wise frequencies for each question(omitting NA values) and make a pie chart by diagnosis. Is there any code you can think of that would provide me with multiple pie charts at one go or should I write a separate code for each question(I have so many questions, that's why I am asking? :D)
So, in the end, I would like to have pie charts like this next to each other for each question:
Thank you so much!
Solution
The data:
library(tidyverse)
mydf <- tribble(
~ID, ~age, ~gender, ~diagnosis, ~A1, ~A2, ~A3,
"a", 22, "female", 1, "A", "D", "B",
"b", 34, "male", 2, "B", "E", NA,
"c", 55, "female", 2, "C", "B", "A",
"d", 55, "female", 1, NA, "A", "B",
"e", 45, "male", 1, "E", "D", "B",
)
Pivot the data and calculate percentages using the table()
and prop.table()
. The factor is used so we can keep all the options.
mydf_ <- mydf |>
pivot_longer(cols = c(A1, A2, A3), names_to = "question", values_to = "answer") |>
group_by(diagnosis, question) |>
mutate(answer = factor(answer, levels = c("A", "B","C", "D", "E"))) |>
summarise(percentage = c(prop.table(table(answer)))) |>
mutate(answer = c("A", "B","C", "D", "E"))
Create the pie chart using geom_bar()
, geom_text()
and coord_polar()
:
mydf_ |>
mutate(percentage = ifelse(percentage == 0, NA, percentage)) |>
ggplot(aes(x = "", y = percentage,
fill = answer,
label = scales::percent(percentage))) +
geom_col() +
geom_text(color = "white", size=6,
position = position_stack(vjust = 0.5)) +
coord_polar("y") +
facet_grid(diagnosis ~ question, switch = "both") +
labs(x = "Diagnosis", y = "Questions") +
theme(axis.text = element_blank(),
axis.ticks = element_blank()
)
Result:
Answered By - Vlad Answer Checked By - Marilyn (PHPFixing Volunteer)
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