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How to create bar plot of means with error bars of standard deviations using ggplot2 in R?
If we have summary data for a group variable then we might want to look at the errors or say differences between mean and standard deviations visually, therefore, we can create a bar plot with error bars of standard deviations. This can be done by using geom_errorbar function of ggplot2 package.
Example
Consider the below data frame −
Group<-c("A","B","C","D")
Mean<-c(24,28,25,24)
SD<-c(2,5,4,3)
df<-data.frame(Group,Mean,SD)
dfOutput
Group Mean SD 1 A 24 2 2 B 28 5 3 C 25 4 4 D 24 3
Loading ggplot2 package and creating bar plot of means −
Example
library(ggplot2) ggplot(df,aes(Group,Mean))+geom_bar(stat="identity")
Output
Creating bar plot with error bars of standard deviations −
Example
ggplot(df,aes(Group,Mean))+geom_bar(stat="identity")+geom_errorbar(aes(x=Group,ym in=Mean-SD,ymax=Mean+SD))
Output
Updated on: 08-Sep-2020
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