Adverse Impact Ratio

nounverified·updated May 18, 2026

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privileged and unprivileged groups receiving different outcomes irrespective of the decision maker’s intent and irrespective of the decision-making procedure. Quantified as the ratio: disparate impact ratio = 𝑃( 𝑦̂ (𝑋) = fav ∣∣ 𝑍 = unpr )/𝑃( 𝑦̂ (𝑋) = fav ∣∣ 𝑍 = priv ) where 𝑃(𝑦̂ (𝑋) = fav) is the favorable label, (𝑍 = priv) is the privileged group, and (𝑍 = unpr) is the unprivileged group.

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§1: privileged and unprivileged groups receiving different outcomes irrespective of the decision maker’s intent and irrespective of the decision-making procedure. Quantified as the ratio: disparate impact ratio = 𝑃( 𝑦̂ (𝑋) = fav ∣∣ 𝑍 = unpr )/𝑃( 𝑦̂ (𝑋) = fav ∣∣ 𝑍 = priv ) where 𝑃(𝑦̂ (𝑋) = fav) is the favorable label, (𝑍 = priv) is the privileged group, and (𝑍 = unpr) is the unprivileged group.