Add significance label and line to a plot

Usage

add_significance_geoms(df, size_star = 2.5, lw = 0.2)

Arguments

df

A dataframe containing one column per variable in the desired aesthetics (x, y, colour, etc.) and the following columns:

x_star: x position of the star label
y_star: y position of the star label
stars: the star label (e.g., "", "", "")
x_line: x position of the start of the line
x_line_end: x position of the end of the line
y_line: y position of the line

size_star

Size of the star label. Default is 2.5.

lw

Line width of the significance line. Default is 0.2.

Value

A list of ggplot2 layers that can be added to a ggplot object.

Examples

group_effect_verbal <-
 tibble::tibble(
   Variable   = factor("OSIVQ-Verbal"),
    x_star     = 1.5,
    y_star     = 1.08,
    stars      = "**",
    x_line     = x_star - 0.5,
    x_line_end = x_star + 0.5,
    y_line     = 1.05
  )

ggplot2::ggplot() +
  ggplot2::scale_x_discrete(limits = factor(c(1, 2))) +
  ggplot2::scale_y_continuous(limits = c(0, 1.1)) +
  ggplot2::labs(x = NULL, y = NULL) +
  ggplot2::facet_wrap(~ Variable, scales = "free_x") +
  add_significance_geoms(group_effect_verbal, size_star = 4)