Grouped scatterplots from ggplot2 combined with marginal histograms/boxplots/density plots with statistical details added as a subtitle.

grouped_ggscatterstats(
  data,
  x,
  y,
  grouping.var,
  label.var = NULL,
  label.expression = NULL,
  title.prefix = NULL,
  output = "plot",
  ...,
  plotgrid.args = list(),
  title.text = NULL,
  title.args = list(size = 16, fontface = "bold"),
  caption.text = NULL,
  caption.args = list(size = 10),
  sub.text = NULL,
  sub.args = list(size = 12)
)

Arguments

data

A dataframe (or a tibble) from which variables specified are to be taken. A matrix or tables will not be accepted.

x

The column in data containing the explanatory variable to be plotted on the x-axis. Can be entered either as a character string (e.g., "x") or as a bare expression (e.g, x).

y

The column in data containing the response (outcome) variable to be plotted on the y-axis. Can be entered either as a character string (e.g., "y") or as a bare expression (e.g, y).

grouping.var

A single grouping variable (can be entered either as a bare name x or as a string "x").

label.var

Variable to use for points labels. Can be entered either as a character string (e.g., "var1") or as a bare expression (e.g, var1).

label.expression

An expression evaluating to a logical vector that determines the subset of data points to label. This argument can be entered either as a character string (e.g., "y < 4 & z < 20") or as a bare expression (e.g., y < 4 & z < 20).

title.prefix

Character string specifying the prefix text for the fixed plot title (name of each factor level) (Default: NULL). If NULL, the variable name entered for grouping.var will be used.

output

If "expression", will return expression with statistical details, while "dataframe" will return a dataframe containing the results.

...

Arguments passed on to ggscatterstats

point.label.args

A list of additional aesthetic arguments to be passed to ggrepel::geom_label_repel geom used to display the labels.

smooth.line.args

A list of additional aesthetic arguments to be passed to ggplot2::geom_smooth geom used to display the regression line.

point.args

A list of additional aesthetic arguments to be passed to ggplot2::geom_point geom used to display the raw data points.

marginal

Decides whether ggExtra::ggMarginal() plots will be displayed; the default is TRUE.

point.width.jitter

Degree of jitter in x and y direction, respectively. Defaults to 0 (0%) of the resolution of the data. Note that the jitter should not be specified in the point.args because this information will be passed to two different geoms: one displaying the points and the other displaying the labels for these points.

point.height.jitter

Degree of jitter in x and y direction, respectively. Defaults to 0 (0%) of the resolution of the data. Note that the jitter should not be specified in the point.args because this information will be passed to two different geoms: one displaying the points and the other displaying the labels for these points.

marginal.type

Type of marginal distribution to be plotted on the axes ("histogram", "boxplot", "density", "violin", "densigram").

marginal.size

Integer describing the relative size of the marginal plots compared to the main plot. A size of 5 means that the main plot is 5x wider and 5x taller than the marginal plots.

xfill

Character describing color fill for x and y axes marginal distributions (default: "#009E73" (for x) and "#D55E00" (for y)). Note that the defaults are colorblind-friendly.

yfill

Character describing color fill for x and y axes marginal distributions (default: "#009E73" (for x) and "#D55E00" (for y)). Note that the defaults are colorblind-friendly.

type

Type of association between paired samples required (""parametric": Pearson's product moment correlation coefficient" or ""nonparametric": Spearman's rho" or ""robust": percentage bend correlation coefficient" or ""bayes": Bayes Factor for Pearson's r"). Corresponding abbreviations are also accepted: "p" (for parametric/pearson), "np" (nonparametric/spearman), "r" (robust), "bf" (for bayes factor), resp.

conf.level

Scalar between 0 and 1. If unspecified, the defaults return 95% confidence/credible intervals (0.95).

bf.prior

A number between 0.5 and 2 (default 0.707), the prior width to use in calculating Bayes factors.

beta

bending constant (Default: 0.1). For more, see WRS2::pbcor().

k

Number of digits after decimal point (should be an integer) (Default: k = 2L).

ggtheme

A function, ggplot2 theme name. Default value is ggplot2::theme_bw(). Any of the ggplot2 themes, or themes from extension packages are allowed (e.g., ggthemes::theme_fivethirtyeight(), hrbrthemes::theme_ipsum_ps(), etc.).

ggstatsplot.layer

Logical that decides whether theme_ggstatsplot theme elements are to be displayed along with the selected ggtheme (Default: TRUE). theme_ggstatsplot is an opinionated theme layer that override some aspects of the selected ggtheme.

bf.message

Logical that decides whether to display Bayes Factor in favor of the null hypothesis. This argument is relevant only for parametric test (Default: TRUE).

results.subtitle

Decides whether the results of statistical tests are to be displayed as a subtitle (Default: TRUE). If set to FALSE, only the plot will be returned.

xlab

Labels for x and y axis variables. If NULL (default), variable names for x and y will be used.

ylab

Labels for x and y axis variables. If NULL (default), variable names for x and y will be used.

subtitle

The text for the plot subtitle. Will work only if results.subtitle = FALSE.

caption

The text for the plot caption.

ggplot.component

A ggplot component to be added to the plot prepared by ggstatsplot. This argument is primarily helpful for grouped_ variants of all primary functions. Default is NULL. The argument should be entered as a ggplot2 function or a list of ggplot2 functions.

plotgrid.args

A list of additional arguments to cowplot::plot_grid.

title.text

String or plotmath expression to be drawn as title for the combined plot.

title.args

A list of additional arguments provided to title, caption and sub, resp.

caption.text

String or plotmath expression to be drawn as the caption for the combined plot.

caption.args

A list of additional arguments provided to title, caption and sub, resp.

sub.text

The label with which the combined plot should be annotated. Can be a plotmath expression.

sub.args

A list of additional arguments provided to title, caption and sub, resp.

References

https://indrajeetpatil.github.io/ggstatsplot/articles/web_only/ggscatterstats.html

See also

Examples

# to ensure reproducibility set.seed(123) library(ggstatsplot) # basic function call ggstatsplot::grouped_ggscatterstats( data = dplyr::filter(movies_long, genre == "Comedy" | genre == "Drama"), x = length, y = rating, method = "lm", formula = y ~ x + I(x^3), grouping.var = genre )
# using labeling # (also show how to modify basic plot from within function call) grouped_ggscatterstats( data = dplyr::filter(ggplot2::mpg, cyl != 5), x = displ, y = hwy, grouping.var = cyl, title.prefix = "Cylinder count", type = "robust", label.var = manufacturer, label.expression = hwy > 25 & displ > 2.5, ggplot.component = ggplot2::scale_y_continuous(sec.axis = ggplot2::dup_axis()) )
#> Warning: ggrepel: 21 unlabeled data points (too many overlaps). Consider increasing max.overlaps
# labeling without expression ggstatsplot::grouped_ggscatterstats( data = dplyr::filter( .data = movies_long, rating == 7, genre %in% c("Drama", "Comedy") ), x = budget, y = length, grouping.var = genre, bf.message = FALSE, label.var = "title", marginal = FALSE, title.prefix = "Genre", caption.text = "All movies have IMDB rating equal to 7." )