Create a histogram filled using another variable in ggplot

Question

I am working with a dataset that includes the age of some people. I am trying to create a histogram for the ages of the people with ggplot in which the colours of the bars of the histogram should depend on some predefined age intervals.

So for example imagine a dataset like this:

>X
   Age   Age2
   10    Under 14
   11    Under 14
   10    Under 14
   13    Under 14
   20    Between 15 and 25
   21    Between 15 and 25
   35    Above 25

I have tried to do something like this:

ggplot(X, aes(x = Age)) + geom_histogram(aes(fill = Age2))

But it displays the following error message:

Error: StatBin requires a continuous x variable the x variable is discrete. Perhaps you want stat="count"?

What am I doing wrong?

From the error message it seems like x (Age) isn't continuous. Try to change Age to as.numeric(Age). — Haboryme
– Haboryme, Commented Jan 16, 2017 at 9:34
Or as.numeric(as.character(Age)) if Age is a factor!! See str(X). — Axeman
– Axeman, Commented Jan 16, 2017 at 10:29

בנימן הגלילי · Accepted Answer · 2017-01-16 13:20:20Z

2

plotted with ggplot2, corrected excessive capitalization.

age <-c(10,11,10,13,20,21,35)
age2<-c(rep("Under 14", times=4), rep("Between 15 and 25",times=2),"Above 25")
X<-as.data.frame(cbind(age,age2))
X$age<-as.numeric(age)
X
names(X)
summary(X)
p<- ggplot(X, aes(x = age))+
  geom_histogram(aes(fill = age2))
p

answered Jan 16, 2017 at 13:20

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