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How to create bar chart based on two groups in an R data frame?
To create a bar chart based on two groups, we can use geom_bar function of ggplot2 package with position argument that defines the position of the groups. For example, if we have a data frame called df that contains two categorical variable x1 and x2 and the one response variable y then the bar chart can be created by using the below command −
ggplot(df,aes(x1,y,fill=x2))+geom_bar(position=position_dodge(),stat="identity")
Example
Consider the below data frame &minus
Gender<−sample(c("Male","Female"),20,replace=TRUE)
Age_Group<−sample(c("20-25","25-35","35-50"),20,replace=TRUE)
Y<−rpois(20,50)
df<−data.frame(Gender,Age_Group,Y)
dfOutput
Gender Age_Group Y 1 Male 20−25 57 2 Female 35−50 49 3 Male 20−25 57 4 Male 20−25 48 5 Male 35−50 52 6 Male 25−35 56 7 Male 35−50 49 8 Male 25−35 55 9 Male 20−25 45 10 Male 20−25 52 11 Male 20−25 55 12 Female 35−50 48 13 Male 20−25 47 14 Male 20−25 44 15 Male 35−50 47 16 Male 35−50 44 17 Female 25−35 49 18 Male 35−50 45 19 Female 35−50 54 20 Female 20−25 50
Loading ggplot2 package and creating the bar chart based on x1 and x2 −
Example
library(ggplot2) ggplot(df,aes(Age_Group,Y,fill=Gender))+geom_bar(position=position_dodge(),stat="identity")
Output
Updated on: 09-Feb-2021
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