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How to display NA frequency for a ggplot2 graph using color brewer in R?
To display NA frequency for a ggplot2 graph using color brewer in R, we can follow the below steps −
- First of all, create a data frame.
- Then, create the chart with default colors.
- After that, use scale_colour_brewer function to create the bar chart and set the color of NA values bar with na.value.
Create the data frame
Let's create a data frame as shown below −
Group<-c("A","B","C",NA)
Count<-c(24,21,27,25)
df<-data.frame(Group,Count)
dfOn executing, the above script generates the below output(this output will vary on your system due to randomization) −
Group Count 1 A 24 2 B 21 3 C 27 4 <NA> 25
Create the bar chart with default colors
Loading ggplot2 package and creating the bar for the data in df −
Group<-c("A","B","C",NA)
Count<-c(24,21,27,25)
df<-data.frame(Group,Count)
library(ggplot2)
ggplot(df,aes(Group,Count,fill=Group))+geom_bar(stat="identity")Output
Create the bar chart with color brewer and change the color of bar representing NA
Use scale_colour_brewer function of ggplot2 package to create the bar chart and set the color of NA values bar to red with na.value as shown below −
Group<-c("A","B","C",NA)
Count<-c(24,21,27,25)
df<-data.frame(Group,Count)
library(ggplot2)
ggplot(df,aes(Group,Count,fill=Group))+geom_bar(stat="identity")+scale_fill_brewer(pa
lette="Accent",na.value="red")Output
Updated on: 14-Aug-2021
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