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Statistical tests
Term | Definition |
---|---|
Mcnemar | 2 groups, same sample (crossover) Nominal data |
Wilcoxon signed rank | 2 groups same sample (crossover) Ordinal data OR Continuous data (not normal distribution; nonparametric) |
Paired t test | 2 groups same sample (crossover) Continuous data (normal distribution; parametric) |
Fishers exact | 2 groups different samples (parallel) Nominal data N< 20 or 20-40 with expected frequency < 5 |
Chi square | 2 groups different samples (parallel) Nominal data with N>40 or expected frequency>\= 5 OR 3 or more groups with different samples (placebo controlled) |
Cochrane Q | 3 or more groups, same sample (dose ranging) Nominal data |
Wilcoxon rank sum Or Mann-Whitney U | 2 groups different samples (parallel) Ordinal data OR Continuous data (not normal distribution; nonparametric) |
Student t test | 2 groups different samples (parallel) Continuous data (normal distribution; parametric) |
Friedman two-way ANOVA | 3 groups or more, same samples (dose ranging) Ordinal data OR Continuous data (not normal distribution; nonparametric) |
Two-way repeated ANOVA | 3 or more groups same sample (Dose ranging) Continuous data (normal distribution; parametric) |
One-way ANOVA | 3 or more groups different samples (vs placebo) Continuous data (normal distribution; parametric$ |
Kruskal walllis | 3 or more groups different samples Ordinal data OR Continuous data (not normal distribution; nonparametric) |