On Learning and Testing of Counterfactual Fairness through Data Preprocessing

Haoyu Chen, Wenbin Lu, Rui Song and Pulak Ghosh

Journal of the American Statistical Association, 2024, vol. 119, issue 546, 1286-1296

Abstract: Machine learning has become more important in real-life decision-making but people are concerned about the ethical problems it may bring when used improperly. Recent work brings the discussion of machine learning fairness into the causal framework and elaborates on the concept of Counterfactual Fairness. In this article, we develop the Fair Learning through dAta Preprocessing (FLAP) algorithm to learn counterfactually fair decisions from biased training data and formalize the conditions where different data preprocessing procedures should be used to guarantee counterfactual fairness. We also show that Counterfactual Fairness is equivalent to the conditional independence of the decisions and the sensitive attributes given the processed nonsensitive attributes, which enables us to detect discrimination in the original decision using the processed data. The performance of our algorithm is illustrated using simulated data and real-world applications. Supplementary materials for this article are available online.

Date: 2024
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DOI: 10.1080/01621459.2023.2186885

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