Question

When I run a density histogram in R, the vertical axis shows densities as fractions. Try this, for example:
hist(rnorm(100), freq = FALSE)

See how the vertical axis shows “0.0”, “0.1”, “0.2”, etc. How can I make it display “0%”, “1%”, “2%”?

Answer 1

Something like this?

x <- rnorm(100)
par(mfrow = c(1, 2))
hist(x, freq = FALSE, axes = FALSE)
axis(2, at = seq(0, 0.4, 0.1), labels = paste(0:4, "%", sep = ""))
hist(x, freq = FALSE)