geom_* and stat_* for Producing Quantile Residual Q-Q Plots with `ggplot2`

Various geom_* and stat_* used within autoplot for producing quantile residual Q-Q plots.

geom_qqr_point(
  mapping = NULL,
  data = NULL,
  stat = "identity",
  position = "identity",
  na.rm = FALSE,
  show.legend = NA,
  inherit.aes = TRUE,
  ...
)

stat_qqr_range(
  mapping = NULL,
  data = NULL,
  geom = "qqr_range",
  position = "identity",
  na.rm = FALSE,
  show.legend = NA,
  inherit.aes = TRUE,
  ...
)

geom_qqr_range(
  mapping = NULL,
  data = NULL,
  stat = "qqr_range",
  position = "identity",
  na.rm = FALSE,
  show.legend = NA,
  inherit.aes = TRUE,
  ...
)

stat_qqr_ref(
  mapping = NULL,
  data = NULL,
  geom = "qqr_ref",
  position = "identity",
  na.rm = FALSE,
  show.legend = NA,
  inherit.aes = TRUE,
  detrend = FALSE,
  identity = TRUE,
  probs = c(0.25, 0.75),
  trafo = qnorm,
  ...
)

geom_qqr_ref(
  mapping = NULL,
  data = NULL,
  stat = "qqr_ref",
  position = "identity",
  na.rm = FALSE,
  show.legend = NA,
  inherit.aes = TRUE,
  detrend = FALSE,
  identity = TRUE,
  probs = c(0.25, 0.75),
  trafo = qnorm,
  ...
)

geom_qqr_confint(
  mapping = NULL,
  data = NULL,
  stat = "qqr_confint",
  position = "identity",
  na.rm = FALSE,
  show.legend = NA,
  inherit.aes = TRUE,
  xlim = NULL,
  n = 101,
  detrend = FALSE,
  identity = TRUE,
  probs = c(0.25, 0.75),
  trafo = qnorm,
  style = c("polygon", "line"),
  ...
)

GeomQqrConfint

Arguments

mapping	Set of aesthetic mappings created by aes() or aes_(). If specified and inherit.aes = TRUE (the default), it is combined with the default mapping at the top level of the plot. You must supply mapping if there is no plot mapping.
data	The data to be displayed in this layer. There are three options: If NULL, the default, the data is inherited from the plot data as specified in the call to ggplot(). A data.frame, or other object, will override the plot data. All objects will be fortified to produce a data frame. See fortify() for which variables will be created. A function will be called with a single argument, the plot data. The return value must be a data.frame, and will be used as the layer data. A function can be created from a formula (e.g. ~ head(.x, 10)).
stat	The statistical transformation to use on the data for this layer, as a string.
position	Position adjustment, either as a string, or the result of a call to a position adjustment function.
na.rm	If FALSE, the default, missing values are removed with a warning. If TRUE, missing values are silently removed.
show.legend	logical. Should this layer be included in the legends? NA, the default, includes if any aesthetics are mapped. FALSE never includes, and TRUE always includes. It can also be a named logical vector to finely select the aesthetics to display.
inherit.aes	If FALSE, overrides the default aesthetics, rather than combining with them. This is most useful for helper functions that define both data and aesthetics and shouldn't inherit behaviour from the default plot specification, e.g. borders().
...	Other arguments passed on to layer(). These are often aesthetics, used to set an aesthetic to a fixed value, like colour = "red" or size = 3. They may also be parameters to the paired geom/stat.
geom	The geometric object to use display the data
detrend	Fix description.
identity	logical, should the identity line be plotted or a theoretical line which passes through probs quantiles computed by trafo.
probs	numeric vector of length two, representing probabilities of reference line used in trafo.
trafo	function for calculating reference line through first and third quartile of theoretical distribution (default: Gaussian qnorm).
xlim	Fix description.
n	Fix description.
style	Fix description.

Format

An object of class GeomQqrConfint (inherits from Geom, ggproto, gg) of length 6.

Examples

if (require("ggplot2")) {
  ## Fit model
  data("CrabSatellites", package = "countreg")
  m1_pois <- glm(satellites ~ width + color, data = CrabSatellites, family = poisson)
  m2_pois <- glm(satellites ~ color, data = CrabSatellites, family = poisson)
  
  ## Compute qqrplot
  q1 <- qqrplot(m1_pois, plot = FALSE)
  q2 <- qqrplot(m2_pois, plot = FALSE)
  
  d <- c(q1, q2) 
  
  ## Get label names
  xlab <- unique(attr(d, "xlab"))
  ylab <- unique(attr(d, "ylab"))
  main <- attr(d, "main")
  main <- make.names(main, unique = TRUE)
  d$group <- factor(d$group, labels = main)
  
  ## Polygon CI around identity line used as reference 
  gg1 <- ggplot(data = d, aes(x, y, na.rm = TRUE)) + 
    geom_qqr_ref() + 
    geom_qqr_confint(fill = "red") + 
    geom_qqr_point() + 
    geom_qqr_range(
      aes(
        x = x_rg_lwr, 
        ymin = y_rg_lwr, 
        ymax = y_rg_upr,
        group = group
      )
    ) + 
    xlab(xlab) + ylab(ylab)

  gg1
  gg1 + facet_wrap(~group)
  
  ## Polygon CI around robust reference line
  gg2 <- ggplot(data = d, aes(x, y, na.rm = TRUE)) + 
    geom_qqr_ref(identity = FALSE, trafo = attr(d, "trafo")) + 
    geom_qqr_confint(identity = FALSE, trafo = attr(d, "trafo"), style = "line") + 
    geom_qqr_point() + 
    geom_qqr_range(
      aes(
        x = x_rg_lwr, 
        ymin = y_rg_lwr, 
        ymax = y_rg_upr,
        group = group
      )
    ) + 
    xlab(xlab) + ylab(ylab)

  gg2
  gg2 + facet_wrap(~group)

  ## Use different `trafo`s with confidence intervals
  q1 <- qqrplot(m1_pois, trafo = qunif, plot = FALSE)
  q2 <- qqrplot(m2_pois, plot = FALSE)
  
  gg3 <- ggplot(data = q1, aes(x, y, na.rm = TRUE)) +
    geom_qqr_ref() +
    geom_qqr_confint(fill = "red", trafo = qunif) +
    geom_qqr_point()
  gg3
  
  gg4 <- ggplot(data = q2, aes(x, y, na.rm = TRUE)) +
    geom_qqr_ref() +
    geom_qqr_confint(fill = "red", trafo = qnorm) +
    geom_qqr_point()
  gg4
}