Appendix

Comparing two unpaired groups

Table 1: Comparing two unpaired groups (effect size functions from package effectsize, except for wilcoxonR() from rcompanion

Data	Test	Function	Effect size	Function
P	T-Test	t.test(var.equal = TRUE)	Cohen’s d	cohens_d()
P	Welch T-Test	t.test(var.equal = FALSE)	Cohen’s d	cohens_d()
NP	Mann–Whitney U	wilcox.test(paired = FALSE)	Rank-biserial r or Wilcoxon R	rank_biserial() or wilcoxonR()
Note: P … Parametric | NP … Non-parametric

Comparing two paired groups

Table 2: Comparing two paired groups (effect size functions from package effectsize, except for wilcoxonR() from rcompanion

Data	Test	Function	Effect size	Function
P	T-Test	t.test(paired = TRUE)	Cohen’s d	cohens_d()
NP	Wilcoxon Signed Rank Test	wilcox.test(paired = TRUE)	Rank biserial r or Wilcoxon R	rank_biserial() or wilcoxonPairedR()
Note: P … Parametric | NP … Non-parametric

Comparing multiple unpaired groups

Table 3: Comparing multiple unpaired groups (effect size functions from package effectsize

Data	Test	Function	Effect size	Function
P	ANOVA	aov()* oneway.test(var.equal = TRUE/FALSE)	Epsilon squared	eta_squared()
NP	Kruskal–Wallis test	kruskal.test()	Epsilon squared (rank)	rank_epsilon_squared()
Note: P … Parametric | NP … Non-parametric | * assumes equal variances