add_expression_col: Template for expressions with statistical details

In statsExpressions: Tidy Dataframes and Expressions with Statistical Details

Template for expressions with statistical details

Description

Creates an expression from a data frame containing statistical details. Ideally, this data frame would come from having run tidy_model_parameters function on your model object.

This function is currently not stable and should not be used outside of this package context.

Usage

add_expression_col(
  data,
  paired = FALSE,
  statistic.text = NULL,
  effsize.text = NULL,
  prior.type = NULL,
  n = NULL,
  n.text = ifelse(paired, list(quote(italic("n")["pairs"])),
    list(quote(italic("n")["obs"]))),
  k = 2L,
  k.df = 0L,
  k.df.error = k.df,
  ...
)

Arguments

data	A data frame containing details from the statistical analysis and should contain some or all of the the following columns: statistic: the numeric value of a statistic. df.error: the numeric value of a parameter being modeled (often degrees of freedom for the test); note that if there are no degrees of freedom (e.g., for non-parametric tests), this column will be irrelevant. df: relevant only if the statistic in question has two degrees of freedom. p.value: the two-sided p-value associated with the observed statistic. method: method describing the test carried out. effectsize: name of the effect size (if not present, same as method). estimate: estimated value of the effect size. conf.level: width for the confidence intervals. conf.low: lower bound for effect size estimate. conf.high: upper bound for effect size estimate. bf10: Bayes Factor value (if bayesian = TRUE).
paired	Logical that decides whether the experimental design is repeated measures/within-subjects or between-subjects. The default is FALSE.
statistic.text	A character that specifies the relevant test statistic. For example, for tests with t-statistic, statistic.text = "t".
effsize.text	A character that specifies the relevant effect size.
prior.type	The type of prior.
n	An integer specifying the sample size used for the test.
n.text	A character that specifies the design, which will determine what the n stands for. It defaults to quote(italic("n")["pairs"]) if paired = TRUE, and to quote(italic("n")["obs"]) if paired = FALSE. If you wish to customize this further, you will need to provide object of language type.
k	Number of digits after decimal point (should be an integer) (Default: k = 2L).
k.df, k.df.error	Number of decimal places to display for the parameters (default: 0L).
...	Currently ignored.

Examples

set.seed(123)

# creating a data frame with stats results
stats_df <- cbind.data.frame(
  statistic  = 5.494,
  df         = 29.234,
  p.value    = 0.00001,
  estimate   = -1.980,
  conf.level = 0.95,
  conf.low   = -2.873,
  conf.high  = -1.088,
  method     = "Student's t-test"
)

# expression for *t*-statistic with Cohen's *d* as effect size
# note that the plotmath expressions need to be quoted
add_expression_col(
  data           = stats_df,
  statistic.text = list(quote(italic("t"))),
  effsize.text   = list(quote(italic("d"))),
  n              = 32L,
  n.text         = list(quote(italic("n")["no.obs"])),
  k              = 3L,
  k.df           = 3L
)

statsExpressions documentation built on Sept. 12, 2023, 5:07 p.m.