CODEWITHSUNDEEP
rggplot2
Yingze Hou
Yingze Hou

Reputation: 21

ggplot binwidth in R

I have a question about the binwidth in ggplot in r.

I have two sets of data, one called "error_hat" and one called "error_tilde". I have made their histogram separately, and I see they are similar to each other.

enter image description here

enter image description here

Now I want to put them together to make a comparison. My code is as followed:

catagory <- c(rep("error_hat",length(error_hat)) , rep("error_tilde",length(error_tilde)))

error <- c(error_hat, error_tilde)

error_data<-data.frame(catagory,error)

ggplot(error_data, aes(x=error,group=catagory,fill=catagory))+
  geom_histogram(position="dodge2", binwidth=0.03)+theme_bw()

It produces a picture like this:

enter image description here

I am wondering why the data in the middle has a different width (since I have set all the width to be 0.03)?

Could anyone help me with this problem? Many thanks!

Upvotes: 2

Views: 2376

Answers (1)

Chase
Chase

Reputation: 69221

This is a consequence of using dodge2 versus dodge. This is the expected behavior as outlined here.

Maybe you want regular dodge instead?

library(ggplot2)
#fake data that mimics yours
set.seed(42)
error_hat <- runif(100)
error_tilde <- runif(100)
catagory <- c(rep("error_hat",length(error_hat)) , rep("error_tilde",length(error_tilde)))
error <- c(error_hat, error_tilde)
error_data<-data.frame(catagory,error)
ggplot(error_data, aes(x=error,group=catagory,fill=catagory))+
  geom_histogram(position="dodge", binwidth=0.03)+theme_bw()

Created on 2019-01-15 by the reprex package (v0.2.1)

Upvotes: 1

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