geom_rain {ggrain}

Raincloud Plots

Description

This function displays individual data points, a boxplot and half a violin plot. It also has the option to connect data points with lines across groups by specifying an id to connect by. Lastly, if desired one can color the dots based of another variable.

Usage

geom_rain(
  mapping = NULL,
  data = NULL,
  inherit.aes = TRUE,
  id.long.var = NULL,
  cov = NULL,
  rain.side = NULL,
  likert = FALSE,
  seed = 42,
  ...,
  point.args = rlang::list2(...),
  point.args.pos = rlang::list2(position = position_jitter(width = 0.04, height = 0, seed
    = seed)),
  line.args = rlang::list2(alpha = 0.2, ...),
  line.args.pos = rlang::list2(position = position_jitter(width = 0.04, height = 0, seed
    = seed), ),
  boxplot.args = rlang::list2(outlier.shape = NA, ...),
  boxplot.args.pos = rlang::list2(width = 0.05, position = position_nudge(x = 0.1), ),
  violin.args = rlang::list2(...),
  violin.args.pos = rlang::list2(side = "r", width = 0.7, position = position_nudge(x =
    0.15), )
)

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)).

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().

id.long.var

A group to connect the lines by - must be a string (e.g., "id").

cov

A covariate to color the dots by - must be as a string (e.g., "cov")

rain.side

How you want the rainclouds displayed, right ("r"), left ("l") or flanking ("f"), for a 1-by-1 flanking raincloud use ("f1x1") and for a 2-by-2 use ("f2x2").

likert

Currently developing, right now just addes y-jitter.

seed

For the jittering in point & line to match.

...

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.

point.args

A list of args for the dots

point.args.pos

A list of positional args for the points

line.args

A list of args for the lines, you need to specify a group to connect them with id.long.var

line.args.pos

A list of positional args for the lines

boxplot.args

A list of args for the boxplot

boxplot.args.pos

A list of positional args for the boxplot

violin.args

A list of args for the violin

violin.args.pos

A list of positional args for the violin

Value

Returns a list of three environments to be used with the 'ggplot()' function in the 'ggplot2' package.

If the id.long.var argument is used the output will be a list of 4 environments.

These 4 environments have a similar structure to 'geom_boxplot()', 'geom_violin()', 'geom_point()' and 'geom_line()' from 'ggplot2'. need library(rlang) need library(ggplot2) depends = ggplot2

References

Allen, M., Poggiali, D., Whitaker, K., Marshall, T. R., van Langen, J., & Kievit, R. A. Raincloud plots: a multi-platform tool for robust data visualization Wellcome Open Research 2021, 4:63. https://doi.org/10.12688/wellcomeopenres.15191.2

Examples

e1 <- ggplot(iris, aes(Species, Sepal.Width, fill = Species))
e1 + geom_rain()

# x must be the discrete variable
# orinetation can be changed with coord_flip()
e1 + geom_rain(alpha = .5) + coord_flip()

# we can color the dots by a covariate
e1 + geom_rain(cov = "Sepal.Length")

# we can edit elements individually
e1 + geom_rain(violin.args = list(alpha = .3, color = NA))

# we can flip them
e1 + geom_rain(rain.side = 'l')
# and move them
e1 +
geom_rain(boxplot.args.pos = list(width = .1, position = position_nudge(x = -.2)))

# they also work longitudinally
e2 <- ggplot(sleep, aes(group, extra, fill = group))
e2 + geom_rain(id.long.var = "ID")

# we can add groups
sleep_dat <- cbind(sleep, data.frame(sex = c(rep("male", 5),
rep("female", 5), rep("male", 5), rep("female", 5))))
e3 <- ggplot(sleep_dat, aes(group, extra, fill = sex))
e3 + geom_rain(alpha = .6)

# add likert example
e4 <- ggplot(mpg, aes(1, hwy, fill = manufacturer))
e4 + geom_rain(likert= TRUE)

# lets make it look nicer
e4 + geom_rain(likert= TRUE,
 boxplot.args.pos = list(position = ggpp::position_dodgenudge(x = .095), width = .1),
 violin.args = list(color = NA, alpha = .5))