Package 'gghalves'

Title: Compose Half-Half Plots Using Your Favourite Geoms
Description: A 'ggplot2' extension for easy plotting of half-half geom combinations. Think half boxplot and half jitterplot, or half violinplot and half dotplot.
Authors: Frederik Tiedemann [aut, cre]
Maintainer: Frederik Tiedemann <[email protected]>
License: MIT + file LICENSE
Version: 0.1.4
Built: 2025-02-07 03:11:49 UTC
Source: https://github.com/erocoar/gghalves

Help Index

A half boxplot

Description

A half boxplot

Usage

geom_half_boxplot(
  mapping = NULL,
  data = NULL,
  stat = "boxplot",
  position = "dodge2",
  ...,
  side = "l",
  center = FALSE,
  nudge = 0,
  outlier.colour = NULL,
  outlier.color = NULL,
  outlier.fill = NULL,
  outlier.shape = 19,
  outlier.size = 1.5,
  outlier.stroke = 0.5,
  outlier.alpha = NULL,
  notch = FALSE,
  notchwidth = 0.5,
  varwidth = FALSE,
  errorbar.draw = TRUE,
  errorbar.length = 0.5,
  na.rm = FALSE,
  show.legend = NA,
  inherit.aes = TRUE
)

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

Use to override the default connection between 'geom_boxplot()' and 'stat_boxplot()'.
position

Position adjustment, either as a string, or the result of a call to a position adjustment function.
...

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.
side

The side of the half-geom, "l" for left and "r" for right, defaults to "l".
center

Boolean whether to center the half-boxplot instead of aligning it to its respective side.
nudge

Add space between the boxplot and the middle of the space allotted to a given factor on the x-axis.
outlier.colour, outlier.color, outlier.fill, outlier.shape, outlier.size, outlier.stroke, outlier.alpha

Default aesthetics for outliers. Set to NULL to inherit from the aesthetics used for the box.

In the unlikely event you specify both US and UK spellings of colour, the US spelling will take precedence.

Sometimes it can be useful to hide the outliers, for example when overlaying the raw data points on top of the boxplot. Hiding the outliers can be achieved by setting outlier.shape = NA. Importantly, this does not remove the outliers, it only hides them, so the range calculated for the y-axis will be the same with outliers shown and outliers hidden.
notch

If FALSE (default) make a standard box plot. If TRUE, make a notched box plot. Notches are used to compare groups; if the notches of two boxes do not overlap, this suggests that the medians are significantly different.
notchwidth

For a notched box plot, width of the notch relative to the body (defaults to notchwidth = 0.5).
varwidth

If FALSE (default) make a standard box plot. If TRUE, boxes are drawn with widths proportional to the square-roots of the number of observations in the groups (possibly weighted, using the weight aesthetic).
errorbar.draw

Draw horizontal whiskers at the top and bottom (the IQR). Defaults to 'TRUE'.
errorbar.length

Length of the horizontal whiskers (errorbar). Defaults to half the width of the half-boxplot
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().

Examples

ggplot(iris, aes(x = Species, y = Petal.Width, fill = Species)) + 
  geom_half_boxplot() 
  
ggplot(iris, aes(x = Species, y = Petal.Width, fill = Species)) + 
  geom_half_boxplot(side = "r") 
  
ggplot(iris, aes(x = Species, y = Petal.Width, fill = Species)) + 
  geom_half_boxplot(center = TRUE)

Half dot plot with sensible parameter settings.

Description

In a dot plot, the width of a dot corresponds to the bin width (or maximum width, depending on the binning algorithm), and dots are stacked, with each dot representing one observation.

Usage

geom_half_dotplot(
  mapping = NULL,
  data = NULL,
  position = "dodge",
  ...,
  binwidth = NULL,
  binaxis = "y",
  method = "dotdensity",
  binpositions = "bygroup",
  stackdir = "up",
  stackratio = 1,
  dotsize = 1,
  stackgroups = FALSE,
  origin = NULL,
  right = TRUE,
  width = NULL,
  drop = FALSE,
  na.rm = FALSE,
  show.legend = NA,
  inherit.aes = TRUE
)

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)).
position

Position adjustment, either as a string, or the result of a call to a position adjustment function.
...

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.
binwidth

When method is "dotdensity", this specifies maximum bin width. When method is "histodot", this specifies bin width. Defaults to 1/30 of the range of the data
binaxis

The axis to bin along, "x" (default) or "y"
method

"dotdensity" (default) for dot-density binning, or "histodot" for fixed bin widths (like stat_bin)
binpositions

When method is "dotdensity", "bygroup" (default) determines positions of the bins for each group separately. "all" determines positions of the bins with all the data taken together; this is used for aligning dot stacks across multiple groups.
stackdir

Which direction to stack the dots. "up" (default) places the half-dotplot on the right side. "down" on the left side.
stackratio

how close to stack the dots. Default is 1, where dots just touch. Use smaller values for closer, overlapping dots.
dotsize

The diameter of the dots relative to binwidth, default 1.
stackgroups

should dots be stacked across groups? This has the effect that position = "stack" should have, but can't (because this geom has some odd properties).
origin

When method is "histodot", origin of first bin
right

When method is "histodot", should intervals be closed on the right (a, b], or not [a, b)
width

When binaxis is "y", the spacing of the dot stacks for dodging.
drop

If TRUE, remove all bins with zero counts
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().

Details

There are two basic approaches: dot-density and histodot. With dot-density binning, the bin positions are determined by the data and 'binwidth', which is the maximum width of each bin. See Wilkinson (1999) for details on the dot-density binning algorithm. With histodot binning, the bins have fixed positions and fixed widths, much like a histogram.

When binning along the x axis and stacking along the y axis, the numbers on y axis are not meaningful, due to technical limitations of ggplot2. You can hide the y axis, as in one of the examples, or manually scale it to match the number of dots.

Computed variables

x

center of each bin, if binaxis is "x"

y

center of each bin, if binaxis is "x"

binwidth

max width of each bin if method is "dotdensity"; width of each bin if method is "histodot"

count

number of points in bin

ncount

count, scaled to maximum of 1

density

density of points in bin, scaled to integrate to 1, if method is "histodot"

ndensity

density, scaled to maximum of 1, if method is "histodot"

References

Wilkinson, L. (1999) Dot plots. The American Statistician, 53(3), 276-281.

Examples

ggplot(iris, aes(x = Species, y = Petal.Width, fill = Species)) + 
  geom_half_dotplot(stackratio = .5, method = "histodot")

Points with jitter for half geoms.

Description

Points with jitter for half geoms.

Usage

geom_half_point(
  mapping = NULL,
  data = NULL,
  stat = "HalfPoint",
  position = "dodge2",
  ...,
  side = "r",
  transformation = position_jitter(),
  range_scale = 0.75,
  na.rm = FALSE,
  show.legend = NA,
  inherit.aes = TRUE
)

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.
...

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.
side

The side on which to draw the half violin plot. "l" for left, "r" for right, defaults to "l".
transformation

An evaluated 'position_*()' function yielding a 'Position' object with specified parameters to calculate the transformation of the points. Defaults to 'ggplot2::position_jitter()'.
range_scale

If no 'width' argument is specified in 'transformation', 'range_scale' is used to determine the width of the jitter. Defaults to '0.75', which is half of the allotted space for the jitter-points, whereas '1' would use all of the allotted space.
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().

Examples

ggplot(iris, aes(x = Species, y = Petal.Width, fill = Species)) + 
  geom_half_point()
  
ggplot(iris, aes(x = Species, y = Petal.Width, fill = Species)) + 
  geom_half_point(side = "l")

Points with jitter for half geoms. Unlike 'geom_half_point', 'geom_half_point_panel' does not dodge different grouping aesthetics. This allows multiple groups in a single cloud of points (see examples).

Description

Points with jitter for half geoms. Unlike 'geom_half_point', 'geom_half_point_panel' does not dodge different grouping aesthetics. This allows multiple groups in a single cloud of points (see examples).

Usage

geom_half_point_panel(
  mapping = NULL,
  data = NULL,
  stat = "identity",
  position = "identity",
  ...,
  side = "r",
  transformation = position_jitter(),
  range_scale = 0.75,
  na.rm = FALSE,
  show.legend = NA,
  inherit.aes = TRUE
)

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.
...

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.
side

The side on which to draw the half violin plot. "l" for left, "r" for right, defaults to "l".
transformation

An evaluated 'position_*()' function yielding a 'Position' object with specified parameters to calculate the transformation of the points. Defaults to 'ggplot2::position_jitter()'.
range_scale

If no 'width' argument is specified in 'transformation', 'range_scale' is used to determine the width of the jitter. Defaults to '0.75', which is half of the allotted space for the jitter-points, whereas '1' would use all of the allotted space.
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().

Examples

ggplot(iris, aes(y = Sepal.Width)) +
  geom_half_boxplot() +
  geom_half_point_panel(aes(x = 0.5, color = Species), range_scale = .5) +
  theme_classic()

Half Violin plot

Description

A violin plot is a compact display of a continuous distribution. It is a blend of [geom_boxplot()] and [geom_density()]: a violin plot is a mirrored density plot displayed in the same way as a boxplot.

Usage

geom_half_violin(
  mapping = NULL,
  data = NULL,
  stat = "half_ydensity",
  position = "dodge",
  ...,
  side = "l",
  nudge = 0,
  draw_quantiles = NULL,
  trim = TRUE,
  scale = "area",
  na.rm = FALSE,
  show.legend = NA,
  inherit.aes = TRUE
)

stat_half_ydensity(
  mapping = NULL,
  data = NULL,
  geom = "half_violin",
  position = "dodge",
  ...,
  bw = "nrd0",
  adjust = 1,
  kernel = "gaussian",
  trim = TRUE,
  scale = "area",
  na.rm = FALSE,
  show.legend = NA,
  inherit.aes = TRUE
)

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)).
position

Position adjustment, either as a string, or the result of a call to a position adjustment function.
...

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.
side

The side on which to draw the half violin plot. "l" for left, "r" for right, defaults to "l".
nudge

Add space between the violinplot and the middle of the space allotted to a given factor on the x-axis.
draw_quantiles

If not(NULL) (default), draw horizontal lines at the given quantiles of the density estimate.
trim

If TRUE (default), trim the tails of the violins to the range of the data. If FALSE, don't trim the tails.
scale

if "area" (default), all violins have the same area (before trimming the tails). If "count", areas are scaled proportionally to the number of observations. If "width", all violins have the same maximum width.
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().
geom, stat

Use to override the default connection between geom_violin() and stat_ydensity().
bw

The smoothing bandwidth to be used. If numeric, the standard deviation of the smoothing kernel. If character, a rule to choose the bandwidth, as listed in stats::bw.nrd().
adjust

A multiplicate bandwidth adjustment. This makes it possible to adjust the bandwidth while still using the a bandwidth estimator. For example, adjust = 1/2 means use half of the default bandwidth.
kernel

Kernel. See list of available kernels in density().

Details

The half-violin plot accepts an optional 'split' aesthethic to compare data separated by a binary variable side-by-side.

References

Hintze, J. L., Nelson, R. D. (1998) Violin Plots: A Box Plot-Density Trace Synergism. The American Statistician 52, 181-184.

See Also

[geom_half_violin()] for examples.

Examples

ggplot(iris, aes(x = Species, y = Petal.Width, fill = Species)) +
  geom_half_violin()

ggplot(iris, aes(x = Species, y = Petal.Width, fill = Species)) +
  geom_half_violin(side = "r")
  
ggplot() +
  geom_half_violin(
    data = ToothGrowth, 
    aes(x = as.factor(dose), y = len, split = supp, fill = supp),
    position = "identity"
  ) + 
  theme_minimal()  
  
ggplot(ToothGrowth, aes(x = supp, y = len, color = supp)) + 
  geom_half_violin(side = c("l", "r"))

ggplot(data = ToothGrowth, aes(x = 1, y = len)) +
  geom_half_point(aes(y = len), side = "l") +
  geom_half_violin(aes(y = len), side = "r") +
  coord_flip()

gghalves extensions to ggplot2

Description

gghalves extensions to ggplot2