Use denominator, boundary, and sensitivity checks to reduce aggregation bias.
The rank changed Jules sees one winner in ZIP codes and another winner in service zones. When the unit changes the story, the boundary is part of the method. Framework Unit -> Denominator -> Sensitivity Aggregation should preserve the decision meaning, normalize exposure, and test boundary sensitivity. Dissolve and rank Easy, but often too trusting. The map separates stable patterns from boundary artifacts. Aggregation is an analytical choice, not a neutral formatting step. 01 Action unit 02 Rate 03 Sensitivity Step 1 ZIP boundaries are available, but service managers act on service zones.
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