I wish to change the variable on the y-axis of my bar graph

Question

I am trying to plot proportions on the y-axis of my bar graph, as opposed to the usual count.

I am doing something like the following:

ggplot(data=mpg, aes(model))+geom_bar(aes(y=stat(count/sum(count)))

I am getting a blank plot.

Dear Student, please make your question [reproducible](https://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example). — NelsonGon, Oct 07 '19 at 15:07
Why do you need `table`, can you show an image of your expected plot? — NelsonGon, Oct 07 '19 at 15:14
Don't use `$` inside `aes` https://stackoverflow.com/questions/32543340/issue-when-passing-variable-with-dollar-sign-notation-to-aes-in-combinatio — camille, Oct 07 '19 at 15:18
@NelsonGon I'm changing my code accordingly. I got a partial answer here: https://stackoverflow.com/questions/36604127/creating-a-bar-plot-with-proportions-on-ggplot But it still isn't working. — Student, Oct 07 '19 at 15:26
I don't get it: you had a reproducible example, and now you've edited it so you no longer do. Without having your data, it's difficult to do more than guess — camille, Oct 07 '19 at 15:31
You're missing a closing parenthesis at the end of that line. Once I add that, I get a plot that looks like what I'd expect. — camille, Oct 07 '19 at 16:11
Sure. I downvoted because after switching between reproducible and non-reproducible questions (which makes it hard for folks answering), what you've settled on seems like it might just be a missing parenthesis. There isn't evidence of much research here—even with the post you link to, you just said "it isn't working," which doesn't help folks help you debug. Take a look back through [ask] and the link in the 1st comment for advice on asking a question that is easy to answer and helpful for future site users — camille, Oct 08 '19 at 03:25

Schilker · Answer 1 · 2019-10-07T15:28:07.153

1

are you talking about coord_flip()? This will turn your chart 90 degrees

EDITED, Added below:

Try this below

  ggplot(data=mpg)+
    geom_bar(mapping=aes(x=model, y=..prop.., group=1))

edited Oct 07 '19 at 15:28

answered Oct 07 '19 at 15:10

Schilker

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No I am not. Basically, instead of count on the vertical axis, I want proportions. – Student Oct 07 '19 at 15:12
see my code in my above answer. "..prop.." will plot the proportions on the y-axis for your x-axis variables. Cheers! – Schilker Oct 07 '19 at 15:21
Excellent. Is there any way to show all percentages between 10 and 100, and to write them as percentages rather than decimals? – Student Oct 07 '19 at 16:13
Also, I don't understand the use of group. I've tried to look it up in RStudio, but to no avail. – Student Oct 08 '19 at 07:01

score 0 · Answer 2 · answered Oct 07 '19 at 15:22

0

You need to create a data frame containing the proportions first, then use stat = "identity".

library(tidyverse)

mtcars %>% 
  as_tibble %>% 
  group_by(cyl) %>% 
  summarize(prop = n()/nrow(.)) %>% 
  ggplot() +
  geom_bar(aes(cyl, prop), stat = "identity")

answered Oct 07 '19 at 15:22

shs

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you don't need to create a whole new dataframe. Just change to "y=..prop..". See my answer. – Schilker Oct 07 '19 at 15:24
You are right, I didn't read your code after you talked about `coord_flip()`, which OP clearly did not ask for – shs Oct 07 '19 at 15:26
1

@Schilker you don't *need* to do the aggregation yourself beforehand, but it's often a good idea since it gives you better control than ggplot alone provides – camille Oct 07 '19 at 15:26
I agree @shs, less is more IMHO – Schilker Oct 07 '19 at 15:29

I wish to change the variable on the y-axis of my bar graph

2 Answers2