Quantile-quantile reference line layer

Adds a fitted reference line to a mark_qq() layer: quantiles of the data projected onto the theoretical distribution. A two-parameter fit passes through the first and third quartile pairs.

Usage

mark_qq_line(
  plot,
  mapping = NULL,
  data = NULL,
  position = NULL,
  ...,
  distribution = "norm",
  line.p = c(0.25, 0.75),
  fullrange = FALSE,
  rasterize = FALSE,
  rasterize_dpi = 300,
  rasterize_dev = "cairo"
)

Arguments

plot

A plotit object

mapping

Optional new aesthetics (inherit from the QQ layer's data: x required)

data

Optional data for this layer

position

Position adjustment.

...

Other arguments passed to geom_qq_line

distribution

Theoretical quantile function name without q (default "norm").

line.p

Quantile pair used for the fit (default c(0.25, 0.75)).

fullrange

If TRUE, extend the line across the panel range.

rasterize

If TRUE, rasterize via ggrastr::rasterise().

rasterize_dpi

DPI for rasterization (default 300).

rasterize_dev

Graphics device for rasterization (default "cairo").

Value

Modified plotit object

Examples

ecdf_data <- data.frame(eruptions = faithful$eruptions)
plotit(ecdf_data, encode(x = eruptions)) |>
  mark_qq() |>
  mark_qq_line()