I'm interested in creating a histogram in R that will contain two (or more) population on top of each other, meaning - I don't want a two histograms sharing the same graph but a bar containing two colors or more.
Found the image below - this is what I want to accomplish.
Any ideas?
23 Answers
That is actually the annoying default in ggplot2:
library(ggplot2) ggplot(iris, aes(x=Sepal.Length, fill=Species)) + geom_histogram() 
Here is another option without using ggplot:
#plot the entire data set (everything) hist(everything, breaks=c(1:10), col="Red") #then everything except one sub group (1 in this case) hist(everything[everything!=1], breaks=c(1:10), col="Blue", add=TRUE) #then everything except two sub groups (1&2 in this case) hist(everything[everything!=1 && everything!=2], breaks=c(1:10), col="Green", add=TRUE) # 1) Define the breaks to use on your Histogram xrange = seq(-3,3,0.1) # 2) Have your vectors ready v1 = rnorm(n=300,mean=1.1,sd=1.5) v2 = rnorm(n=350,mean=1.3,sd=1.5) v3 = rnorm(n=380,mean=1.2,sd=1.9) # 3) subset your vectors to be inside xrange v1 = subset(v1,v1<=max(xrange) & v1>=min(xrange)) v2 = subset(v2,v2<=max(xrange) & v2>=min(xrange)) v3 = subset(v3,v3<=max(xrange) & v3>=min(xrange)) # 4) Now, use hist to compute the counts per interval hv1 = hist(v1,breaks=xrange,plot=F)$counts hv2 = hist(v2,breaks=xrange,plot=F)$counts hv3 = hist(v3,breaks=xrange,plot=F)$counts # 5) Finally, Generate a Frequency BarPlot that is equivalent to a Stacked histogram maintitle = "Stacked Histogram Example using Barplot" barplot(rbind(hv1,hv2,hv3),col=2:4,names.arg=xrange[-1],space=0,las=1,main=maintitle) # 6) You can also generate a Density Barplot Total = hv1 + hv2 + hv3 barplot(rbind(hv1/Total,hv2/Total,hv3/Total),col=2:4,names.arg=xrange[-1],space=0,las=1) 
