This is a repeat of a question originally asked here: Indicating the statistically significant difference in bar graph but asked for R instead of python.
My question is very simple. I want to produce barplots in R, using ggplot2 if possible, with an indication of significant difference between the different bars, e.g. produce something like this. I have had a search around but can't find another question asking exactly the same thing.
You can use
annotate() to get similar result. For this example you have to determine suitable position yourself. In
geom_path() four numbers are provided to get those small ticks for connecting lines.
df<-data.frame(group=c("A","B","C","D"),numb=c(12,24,36,48)) g<-ggplot(df,aes(group,numb))+geom_bar(stat="identity") g+geom_path(x=c(1,1,2,2),y=c(25,26,26,25))+ geom_path(x=c(2,2,3,3),y=c(37,38,38,37))+ geom_path(x=c(3,3,4,4),y=c(49,50,50,49))+ annotate("text",x=1.5,y=27,label="p=0.012")+ annotate("text",x=2.5,y=39,label="p<0.0001")+ annotate("text",x=3.5,y=51,label="p<0.0001")