pairwise_caption: Pairwise comparison test expression
Description
This returns an expression containing details about the pairwise comparison
test and the p-value adjustment method. These details are typically
included in the ggstatsplot package plots as a caption.
Decides which pairwise comparisons to display.
Available options are:
"significant" (abbreviation accepted: "s")
"non-significant" (abbreviation accepted: "ns")
"all"
You can use this argument to make sure that your plot is not uber-cluttered
when you have multiple groups being compared and scores of pairwise
comparisons being displayed.