Add a source note to a figure

Name the data source on the figure so readers can check where the numbers came from. This follows Tufte's documentation principle and wraps labs(caption = ...) with consistent formatting.

Usage

label_source(source, note = NULL, prefix = "Source:")

Arguments

source

Where the data came from.

note

Optional extra note, appended after the source.

prefix

Label placed before the source. Defaults to "Source:".

Value

A ggplot2 labs object, to be added to a plot.

Examples

library(ggplot2)
ggplot(mtcars, aes(wt, mpg)) +
  geom_point() +
  theme_tufte() +
  label_source("Motor Trend, 1974", note = "n = 32 cars.")