ggbarstats
Bar (column) charts with statistical tests
Bar charts for categorical data with statistical details included in the plot as a subtitle.
Usage
ggbarstats(data, main, condition = NULL, counts = NULL, ratio = NULL,
paired = FALSE, labels.legend = NULL, results.subtitle = TRUE,
stat.title = NULL, sample.size.label = TRUE, label.separator = " ",
label.text.size = 4, label.fill.color = "white",
label.fill.alpha = 1, bar.outline.color = "black",
bf.message = TRUE, sampling.plan = "indepMulti",
fixed.margin = "rows", prior.concentration = 1, title = NULL,
subtitle = NULL, caption = NULL, legend.position = "right",
x.axis.orientation = NULL, conf.level = 0.95, nboot = 100,
simulate.p.value = FALSE, B = 2000, legend.title = NULL,
xlab = NULL, ylab = "Percent", k = 2, perc.k = 0,
bar.label = "percentage", data.label = NULL, bar.proptest = TRUE,
ggtheme = ggplot2::theme_bw(), ggstatsplot.layer = TRUE,
package = "RColorBrewer", palette = "Dark2", direction = 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.
- main
The variable to use as the rows in the contingency table.
- condition
The variable to use as the columns in the contingency table.
- counts
A string naming a variable in data containing counts, or
NULL
if each row represents a single observation (Default).- ratio
A vector of numbers: the expected proportions for the proportion test. Default is
NULL
, which means if there are two levelsratio = c(1,1)
, etc.- paired
Logical indicating whether data came from a within-subjects design study (Default:
FALSE
). IfTRUE
, McNemar test subtitle will be returned. IfFALSE
, Pearson's chi-square test will be returned.- labels.legend
A character vector with custom labels for levels of the
main
variable displayed in the legend.- results.subtitle
Decides whether the results of statistical tests are to be displayed as a subtitle (Default:
TRUE
). If set toFALSE
, only the plot will be returned.- stat.title
Title for the effect being investigated with the chi-square test. The default is
NULL
, i.e. no title will be added to describe the effect being shown. An example of astat.title
argument will be something like"main x condition"
or"interaction"
.- sample.size.label
Logical that decides whether sample size information should be displayed for each level of the grouping variable
condition
(Default:TRUE
).- label.separator
If
"both"
counts and proportion information is to be displayed in a label, this argument decides whether these two pieces of information are going to be on the same line (" "
) or on separate lines ("\n"
).- label.text.size
Numeric that decides text size for slice/bar labels (Default:
4
).- label.fill.color
Character that specifies fill color for slice/bar labels (Default:
white
).- label.fill.alpha
Numeric that specifies fill color transparency or
"alpha"
for slice/bar labels (Default:1
range0
to1
).- bar.outline.color
Character specifying color for bars (default:
"black"
).- bf.message
Logical that decides whether to display a caption with results from bayes factor test in favor of the null hypothesis (default:
FALSE
).- sampling.plan
Character describing the sampling plan. Possible options are
"indepMulti"
(independent multinomial; default),"poisson"
,"jointMulti"
(joint multinomial),"hypergeom"
(hypergeometric). For more, see?BayesFactor::contingencyTableBF()
.- fixed.margin
For the independent multinomial sampling plan, which margin is fixed (
"rows"
or"cols"
). Defaults to"rows"
.- prior.concentration
Specifies the prior concentration parameter, set to
1
by default. It indexes the expected deviation from the null hypothesis under the alternative, and corresponds to Gunel and Dickey's (1974)"a"
parameter.- title
The text for the plot title.
- subtitle
The text for the plot subtitle. Will work only if
results.subtitle = FALSE
.- caption
The text for the plot caption.
- legend.position
The position of the legend
"none"
,"left"
,"right"
,"bottom"
,"top"
(Default:"right"
).- x.axis.orientation
The orientation of the
x
axis labels one of "slant" or "vertical" to change from the default horizontal orientation (Default:NULL
which is horizontal).- 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
).- simulate.p.value
a logical indicating whether to compute p-values by Monte Carlo simulation.
- B
an integer specifying the number of replicates used in the Monte Carlo test.
- legend.title
Title text for the legend.
- xlab
Custom text for the
x
axis label (Default:NULL
, which will cause thex
axis label to be themain
variable).- ylab
Custom text for the
y
axis label (Default:"percent"
).- k
Number of digits after decimal point (should be an integer) (Default:
k = 2
).- perc.k
Numeric that decides number of decimal places for percentage labels (Default:
0
).- bar.label, data.label
Character decides what information needs to be displayed on the label in each pie slice. Possible options are
"percentage"
(default),"counts"
,"both"
.- bar.proptest
Decides whether proportion test for
main
variable is to be carried out for each level ofcondition
(Default:TRUE
).- ggtheme
A function,
ggplot2
theme name. Default value isggplot2::theme_bw()
. Any of theggplot2
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 selectedggtheme
(Default:TRUE
).- package
Name of package from which the palette is desired as string or symbol.
- palette
If a character string (e.g.,
"Set1"
), will use that named palette. If a number, will index into the list of palettes of appropriate type. Default palette is"Dark2"
.- direction
Either
1
or-1
. If-1
the palette will be reversed.- ggplot.component
A
ggplot
component to be added to the plot prepared byggstatsplot
. This argument is primarily helpful forgrouped_
variant of the current function. Default isNULL
. The argument should be entered as a function. If the given function has an argumentaxes.range.restrict
and if it has been set toTRUE
, 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, which will be aNULL
if you setresults.subtitle = FALSE
. Setting this to"caption"
will return the expression containing details about Bayes Factor analysis, but valid only whentype = "p"
andbf.message = TRUE
, otherwise this will return aNULL
.- messages
Decides whether messages references, notes, and warnings are to be displayed (Default:
TRUE
).
Value
Unlike a number of statistical softwares, ggstatsplot
doesn't
provide the option for Yates' correction for the Pearson's chi-squared
statistic. This is due to compelling amount of Monte-Carlo simulation
research which suggests that the Yates' correction is overly conservative,
even in small sample sizes. As such it is recommended that it should not
ever be applied in practice (Camilli & Hopkins, 1978, 1979; Feinberg, 1980;
Larntz, 1978; Thompson, 1988).
For more about how the effect size measures and their confidence intervals
are computed, see ?rcompanion::cohenG
, ?rcompanion::cramerV
, and
?rcompanion::cramerVFit
.
See Also
Examples
# NOT RUN {
# for reproducibility
set.seed(123)
# simple function call with the defaults (with condition)
ggstatsplot::ggbarstats(
data = datasets::mtcars,
main = vs,
condition = cyl,
nboot = 10,
labels.legend = c("0 = V-shaped", "1 = straight"),
legend.title = "Engine"
)
# }
# NOT RUN {
# simple function call with the defaults (with count data)
library(jmv)
ggstatsplot::ggbarstats(
data = as.data.frame(HairEyeColor),
main = Eye,
condition = Hair,
counts = Freq
)
# }