create a boxplot in R that labels a box with the sample size (N)

Question

Is there a way to create a boxplot in R that will display with the box (somewhere) an \"N=(sample size)\"? The varwidth logical adjusts the width of the box on the basis of sam

Answer 1

You can use the names parameter to write the n next to each factor name.

If you don't want to calculate the n yourself you could use this little trick:

# Do the boxplot but do not show it
b <- boxplot(xvar ~ f1, data=frame, plot=0)
# Now b$n holds the counts for each factor, we're going to write them in names
boxplot(xvar ~ f1, data=frame, xlab="input values", names=paste(b$names, "(n=", b$n, ")"))