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Illustration of Parametric and Nonparametric Analysis Decision Tree.
| 2 Independent Groups | 2 Dependent Groups | >2 Independent Groups | >2 Dependent Groups | |
|---|---|---|---|---|
| Parametric | N > 30 | Sample sizes equal | No minimum n | No minimum n |
| Sample sizes equal | ||||
| Independent t test | Dependent t test | One-way ANOVA | Repeated-measures ANOVA | |
| Nonparametric | N ≥ 8 | N ≥ 5 | No minimum n | No minimum n |
| Mann-Whitney | Wilcoxon | Kruskal-Wallis | Friedman’s ANOVA |
Abbreviation: ANOVA, analysis of variance.
