geom_* and stat_* for Producing PIT Histograms with `ggplot2`

Various geom_* and stat_* used within autoplot for producing PIT histograms.

stat_rootogram(
  mapping = NULL,
  data = NULL,
  geom = "rootogram",
  position = "identity",
  na.rm = FALSE,
  show.legend = NA,
  inherit.aes = TRUE,
  scale = c("sqrt", "raw"),
  style = c("hanging", "standing", "suspended"),
  ...
)

geom_rootogram(
  mapping = NULL,
  data = NULL,
  stat = "rootogram",
  position = "identity",
  na.rm = FALSE,
  show.legend = NA,
  inherit.aes = TRUE,
  scale = c("sqrt", "raw"),
  style = c("hanging", "standing", "suspended"),
  ...
)

stat_rootogram_expected(
  mapping = NULL,
  data = NULL,
  geom = "rootogram_expected",
  position = "identity",
  na.rm = FALSE,
  show.legend = NA,
  inherit.aes = TRUE,
  scale = c("sqrt", "raw"),
  ...
)

geom_rootogram_expected(
  mapping = NULL,
  data = NULL,
  stat = "rootogram_expected",
  position = "identity",
  na.rm = FALSE,
  show.legend = NA,
  inherit.aes = TRUE,
  scale = c("sqrt", "raw"),
  linestyle = c("both", "line", "point"),
  ...
)

GeomRootogramExpected

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

stat_rootogram_confint(
  mapping = NULL,
  data = NULL,
  geom = "rootogram_confint",
  position = "identity",
  na.rm = FALSE,
  show.legend = NA,
  inherit.aes = TRUE,
  level = 0.95,
  nrep = 1000,
  type = c("pointwise", "simultaneous"),
  scale = c("sqrt", "raw"),
  rootogram_style = c("hanging", "standing", "suspended"),
  ...
)

geom_rootogram_confint(
  mapping = NULL,
  data = NULL,
  stat = "rootogram_confint",
  position = "identity",
  na.rm = FALSE,
  show.legend = NA,
  inherit.aes = TRUE,
  level = 0.95,
  nrep = 1000,
  type = c("pointwise", "simultaneous"),
  scale = c("sqrt", "raw"),
  rootogram_style = c("hanging", "standing", "suspended"),
  ...
)

Format

An object of class GeomRootogramExpected (inherits from GeomPath, Geom, ggproto, gg) of length 3.

Arguments

mapping

Set of aesthetic mappings created by 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)).

geom

The geometric object to use to display the data, either as a ggproto Geom subclass or as a string naming the geom stripped of the geom_ prefix (e.g. "point" rather than "geom_point")

position

Position adjustment, either as a string naming the adjustment (e.g. "jitter" to use position_jitter), or the result of a call to a position adjustment function. Use the latter if you need to change the settings of the adjustment.

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().

scale

character specifying whether values should be transformed to the square root scale (not checking for original scale, so maybe applied again).

style

character specifying the syle of rootogram (see below).

...

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.

stat

The statistical transformation to use on the data for this layer, either as a ggproto Geom subclass or as a string naming the stat stripped of the stat_ prefix (e.g. "count" rather than "stat_count")

linestyle

Character string defining one of `"both"`, `"line"` or `"point"`.

level

numeric. The confidence level required.

nrep

numeric. The repetition number of simulation for computing the confidence intervals.

type

character. Should "pointwise" or "simultaneous" confidence intervals be visualized.

rootogram_style

character specifying the syle of rootogram.

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 rootogram (on raw scale)
  p1 <- rootogram(m1_pois, scale = "raw", plot = FALSE)
  p2 <- rootogram(m2_pois, scale = "raw", plot = FALSE)

  d <- c(p1, p2)

  ## Get label names
  main <- attr(d, "main")
  main <- make.names(main, unique = TRUE)
  d$group <- factor(d$group, labels = main)

  ## Plot rootograms w/ on default "sqrt" scale
  gg1 <- ggplot(data = d) +
    geom_rootogram(aes(
      observed = observed, expected = expected, mid = mid,
      width = width, group = group
    )) +
    geom_rootogram_expected(aes(expected = expected, mid = mid)) +
    geom_rootogram_ref() +
    facet_grid(group ~ .) + 
    xlab("satellites") +
    ylab("sqrt(Frequency)")
  gg1
}