Helper function for ggstatsplot::gghistostats to apply this function across multiple levels of a given factor and combining the resulting plots using ggstatsplot::combine_plots.

grouped_gghistostats(data, x, grouping.var, title.prefix = NULL,
  binwidth = NULL, bar.measure = "count", xlab = NULL,
  stat.title = NULL, subtitle = NULL, caption = NULL,
  type = "parametric", test.value = 0, bf.prior = 0.707,
  bf.message = TRUE, robust.estimator = "onestep",
  effsize.type = "g", effsize.noncentral = TRUE, conf.level = 0.95,
  nboot = 100, k = 2, ggtheme = ggplot2::theme_bw(),
  ggstatsplot.layer = TRUE, fill.gradient = FALSE,
  low.color = "#0072B2", high.color = "#D55E00", bar.fill = "grey50",
  results.subtitle = TRUE, centrality.para = "mean",
  centrality.color = "blue", centrality.size = 1,
  centrality.linetype = "dashed", centrality.line.labeller = TRUE,
  centrality.k = 2, test.value.line = FALSE,
  test.value.color = "black", test.value.size = 1,
  test.value.linetype = "dashed", test.line.labeller = TRUE,
  test.k = 0, normal.curve = FALSE, normal.curve.color = "black",
  normal.curve.linetype = "solid", normal.curve.size = 1,
  ggplot.component = NULL, return = "plot", messages = TRUE, ...)

Arguments

data

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

x

A numeric variable.

grouping.var

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

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.

binwidth

The width of the histogram bins. Can be specified as a numeric value, or a function that calculates width from x. The default is to use the max(x) - min(x) / sqrt(N). You should always check this value and explore multiple widths to find the best to illustrate the stories in your data.

bar.measure

Character describing what value needs to be represented as height in the bar chart. This can either be "count", which shows number of points in bin, or "density", which density of points in bin, scaled to integrate to 1, or "proportion", which shows relative frequencies of observations in each bin, or "mix", which shows both count and proportion in the same plot.

xlab

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

stat.title

A character describing the test being run, which will be added as a prefix in the subtitle. The default is NULL. An example of a stat.title argument will be something like "Student's t-test: ".

subtitle

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

caption

The text for the plot caption.

type

Type of statistic expected ("parametric" or "nonparametric" or "robust" or "bayes").Corresponding abbreviations are also accepted: "p" (for parametric), "np" (nonparametric), "r" (robust), or "bf"resp.

test.value

A number specifying the value of the null hypothesis (Default: 0).

bf.prior

A numeric value between 0.5 and 2 (default 0.707), the prior width to use in calculating Bayes Factors.

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).

robust.estimator

If type = "robust", a robust estimator to be used ("onestep" (Default), "mom", or "median"). For more, see ?WRS2::onesampb.

effsize.type

Type of effect size needed for parametric tests. The argument can be "biased" ("d" for Cohen's d) or "unbiased" ("g" Hedge's g for t-test). The default is "g".

effsize.noncentral

Logical indicating whether to use non-central t-distributions for computing the confidence interval for Cohen's d or Hedge's g (Default: TRUE).

conf.level

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

nboot

Number of bootstrap samples for computing confidence interval for the effect size (Default: 100).

k

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

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.

fill.gradient

Logical decides whether color fill gradient is to be displayed (Default: FALSE). If FALSE, the legend and the color gradient will also be removed. The default is set to FALSE because the gradient provides redundant information in light of y-axis labels.

low.color

Colors for low and high ends of the gradient. Defaults are colorblind-friendly.

high.color

Colors for low and high ends of the gradient. Defaults are colorblind-friendly.

bar.fill

If fill.gradient = FALSE, then bar.fill decides which color will uniformly fill all the bars in the histogram (Default: "grey50").

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.

centrality.para

Decides which measure of central tendency ("mean" or "median") is to be displayed as a vertical line.

centrality.color

Decides color for the vertical line for centrality parameter (Default: "blue").

centrality.size

Decides size for the vertical line for centrality parameter (Default: 1.2).

centrality.linetype

Decides linetype for the vertical line for centrality parameter (Default: "dashed").

centrality.line.labeller

A logical that decides whether line labels should be displayed for the centrality.para line (Default: TRUE).

centrality.k

Integer denoting the number of decimal places expected for centrality parameter label. (Default: 2).

test.value.line

Decides whether test value is to be displayed as a vertical line (Default: FALSE).

test.value.color

Decides color for the vertical line denoting test value (Default: "black").

test.value.size

Decides size for the vertical line for test value (Default: 1.2).

test.value.linetype

Decides linetype for the vertical line for test value (Default: "dashed").

test.line.labeller

A logical that decides whether line labels should be displayed for test.value line (Default: TRUE).

test.k

Integer denoting the number of decimal places expected for test.value label. (Default: 0 ).

normal.curve

Logical decides whether to super-impose a normal curve using stats::dnorm(mean(x), sd(x)). Default is FALSE.

normal.curve.color

If normal.curve = TRUE, then these arguments can be used to modify color (Default: "black"), size (default: 1.0), linetype (default: "solid").

normal.curve.linetype

If normal.curve = TRUE, then these arguments can be used to modify color (Default: "black"), size (default: 1.0), linetype (default: "solid").

normal.curve.size

If normal.curve = TRUE, then these arguments can be used to modify color (Default: "black"), size (default: 1.0), linetype (default: "solid").

ggplot.component

A ggplot component to be added to the plot prepared by ggstatsplot. This argument is primarily helpful for grouped_ variant of the current function. Default is NULL. The argument should be entered as a function. If the given function has an argument axes.range.restrict and if it has been set to TRUE, the added ggplot component might not work as expected.

return

Character that describes what is to be returned: can be "plot" (default) or "subtitle" or "caption". Setting this to "subtitle" will return the expression containing statistical results. If you have set results.subtitle = FALSE, then this will return a NULL. Setting this to "caption" will return the expression containing details about Bayes Factor analysis, but valid only when type = "parametric" and bf.message = TRUE, otherwise this will return a NULL.

messages

Decides whether messages references, notes, and warnings are to be displayed (Default: TRUE).

...

Arguments passed on to combine_plots

title.text

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

title.color

Text color for title.

title.size

Point size of title text.

title.vjust

Vertical justification for title. Default = 0.5 (centered on y). 0 = baseline at y, 1 = ascender at y.

title.hjust

Horizontal justification for title. Default = 0.5 (centered on x). 0 = flush-left at x, 1 = flush-right.

title.fontface

The font face ("plain", "bold" (default), "italic", "bold.italic") for title.

caption.text

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

caption.color

Text color for caption.

caption.size

Point size of title text.

caption.vjust

Vertical justification for caption. Default = 0.5 (centered on y). 0 = baseline at y, 1 = ascender at y.

caption.hjust

Horizontal justification for caption. Default = 0.5 (centered on x). 0 = flush-left at x, 1 = flush-right.

caption.fontface

The font face ("plain" (default), "bold", "italic", "bold.italic") for caption.

sub.text

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

sub.color

Text color for annotation label (Default: "black").

sub.size

Point size of annotation text (Default: 12).

sub.x

The x position of annotation label (Default: 0.5).

sub.y

The y position of annotation label (Default: 0.5).

sub.hjust

Horizontal justification for annotation label (Default: 0.5).

sub.vjust

Vertical justification for annotation label (Default: 0.5).

sub.vpadding

Vertical padding. The total vertical space added to the label, given in grid units. By default, this is added equally above and below the label. However, by changing the y and vjust parameters, this can be changed (Default: grid::unit(1, "lines")).

sub.fontface

The font face ("plain" (default), "bold", "italic", "bold.italic") for the annotation label.

sub.angle

Angle at which annotation label is to be drawn (Default: 0).

sub.lineheight

Line height of annotation label.

title.caption.rel.heights

Numerical vector of relative columns heights while combining (title, plot, caption).

title.rel.heights

Numerical vector of relative columns heights while combining (title, plot).

caption.rel.heights

Numerical vector of relative columns heights while combining (plot, caption).

References

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

See also

Examples

# \donttest{ # for reproducibility set.seed(123) # plot ggstatsplot::grouped_gghistostats( data = iris, x = Sepal.Length, test.value = 5, grouping.var = Species, bar.fill = "orange", nrow = 1, ggplot.component = list( ggplot2::scale_x_continuous(breaks = seq(3, 9, 1), limits = (c(3, 9))), ggplot2::scale_y_continuous(breaks = seq(0, 25, 5), limits = (c(0, 25))) ), messages = FALSE )
#> Warning: full precision may not have been achieved in 'pnt{final}'
#> Warning: full precision may not have been achieved in 'pnt{final}'
#> t is large; approximation invoked.
#> Warning: full precision may not have been achieved in 'pnt{final}'
#> Warning: full precision may not have been achieved in 'pnt{final}'
# }