Relationships · Interactive concept
Comparing Groups with Ranks
What changes when we replace observed values with their ranks?
Page 1 of 6 · Question
Why compare ranks?
A few extreme values can strongly affect a mean. The Wilcoxon rank-sum test—also called the Mann–Whitney test—asks whether observations from two independent groups tend to occupy different positions in their pooled ordering.
Data structure: one quantitative or ordinal outcome, two independent groups,
and independent observations within and across groups.
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