- Comparing means
Is there a difference ?
Ordinal and numerical measures 1 group N ≥ 30 One-sample t-test N < 30 Normally distributed One-sample t-test Not normal Sign test 2 groups Independent N ≥ 30 t-test N < 30 Normally distributed t-test Not normal Mann–Whitney U or Wilcoxon signed-rank test Paired N ≥ 30 paired t-test N < 30 Normally distributed paired t-test Not normal Wilcoxon signed-rank test 3 or more groups Independent Normally distributed 1 factor One way anova ≥ 2 factors two or other anova Not normal Kruskal–Wallis one-way analysis of variance by ranks Dependent Normally distributed Repeated measures anova Not normal Friedman two-way analysis of variance by ranks Nominal measures 1 group np and n(1-p) ≥ 5 z-approximation np or n(1-p) < 5 binomial 2 groups Independent np < 5 fisher exact test np ≥ 5 chi-square test Paired McNemar or Kappa 3 or more groups Independent np < 5 collapse categories for chi-square test np ≥ 5 chi-square test Dependent Cochran´s Q
- Dawson-Saunders, Beth; Trapp, Robert G. (1994). Basic & Clinical Biostatistics. Lange Medical Books. ISBN 0-8385-0542-2.
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