ConceptHHI
Herfindahl-Hirschman Index
A statistical indicator originally used to measure market concentration (the sum of squared shares of participants). It can be repurposed to characterize the concentration of model adoption shares, reflecting the nonlinear nature of error aggregation.
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Oct 28
The Herfindahl-Hirschman Index (HHI) can be borrowed to characterize the concentration of model adoption shares: the HHI is 1 when all decision-makers use the same model, and approaches 0 when fully dispersed.
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