Method 1 | Method 2 | Method 3 | |
---|---|---|---|
Assumptions | Normally distributed continuous data | Non-normally distributed continuous data | Ordinal data, constant and relatively small odds ratio, large sample size |
Summary Measure | Mean and mean difference | Median | Odds Ratio (OR _{ Ordinal }) |
Hypothesis test | Two-independent samples t-test | Mann-Whitney U test | Mann-Whitney U test or equivalent proportional odds model |
Effect Size | p _{ Noether }= Pr(Y >X) | ||
Sample size formulae |