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Fairness: disparate impact
Check whether a model or rule selects or approves two groups at fair rates.
AI evaluationHow it's worked out
- Disparate impact = selection rate B ÷ selection rate A. Equal opportunity difference = TPR B − TPR A
- Group A as the reference group
NoteThe four-fifths rule is a screening test from US employment practice, not proof of fairness or unfairness. Pick fairness measures that match the decision and the law that applies.
Source: US EEOC Uniform Guidelines (four-fifths rule); Hardt et al. (2016) equal opportunity; ISO/IEC TR 24027
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