A footnote is generally used to give references to a document, text or image and it is called citation. It helps the reader or viewer to check out the original source using the new text or image is generated. If we want to give citation to a plot in R using ggplot2 package then we can add labs that has caption option to add the footnotes.
Consider the below data frame −
> set.seed(1) > x<-rnorm(10,1.5) > y<-rnorm(10,2.5) > df<-data.frame(x,y) > df
x y 1 0.8735462 4.0117812 2 1.6836433 2.8898432 3 0.6643714 1.8787594 4 3.0952808 0.2853001 5 1.8295078 3.6249309 6 0.6795316 2.4550664 7 1.9874291 2.4838097 8 2.2383247 3.4438362 9 2.0757814 3.3212212 10 1.1946116 3.0939013
Loading ggplot2 package and creating a scatterplot between x and y −
> library(ggplot2) > ggplot(df,aes(x,y))+geom_point()
Creating the plot with footnote −
> ggplot(df,aes(x,y))+geom_point()+labs(caption="Correlation Analysis")