Relationships · Interactive concept
Comparing Groups with Ranks
What changes when we replace observed values with their ranks?
Page 1 of 7 · Big Picture
The big picture: Comparing Groups with Ranks
What changes when we replace observed values with their ranks?
Why a policy analyst should care
Ranks reduce the leverage of extreme measurements and compare relative position, but the resulting test is not simply a test of means or always a test of medians.
Follow the idea from the opening question to a practical decision. These are the conceptual moves this module will develop:
1 Question Why compare ranks?
2 Explore Shift one distribution
3 Formalize From rank sums to U
4 Transfer Audit a rank-sum conclusion
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