R boxplot() to Create Box Plot (With Numerous Examples) - DataMentor We use the arguments at and names to denote the place and label. boxplot (ozone, ozone_norm, temp, temp_norm, main = "Multiple boxplots for comparision", at = c (1,2,4,5), names = c ("ozone", "normal", "temp", "normal"), las = 2, col = c ("orange","red"), border = "brown", horizontal = TRUE, notch = TRUE ) Boxplot form Formula