R Draw Frequencies & Percentages on Top of Histogram Bars (2 Examples)

In this R programming post you’ll learn how to show counts and percentages in histograms.

Exemplifying Data

data(iris)                     # Example data
head(iris)
#   Sepal.Length Sepal.Width Petal.Length Petal.Width Species
# 1          5.1         3.5          1.4         0.2  setosa
# 2          4.9         3.0          1.4         0.2  setosa
# 3          4.7         3.2          1.3         0.2  setosa
# 4          4.6         3.1          1.5         0.2  setosa
# 5          5.0         3.6          1.4         0.2  setosa
# 6          5.4         3.9          1.7         0.4  setosa
hist(iris$Sepal.Length)        # Histogram without labels

r graph figure 1 r draw frequencies percentages on top histogram bars

Example 1: Display Frequencies Above Histogram Bars

hist(iris$Sepal.Length,        # Histogram with frequency labels
     labels = TRUE)

r graph figure 2 r draw frequencies percentages on top histogram bars

Example 2: Display Percentages Above Histogram Bars

hist(iris$Sepal.Length,        # Histogram with percentage labels
     labels = paste0(hist(iris$Sepal.Length, plot = FALSE)$counts, "%"))

r graph figure 3 r draw frequencies percentages on top histogram bars

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