De-Biasing Models of Biased Decisions: A Comparison of Methods Using Mortgage Application Data
对偏差决策模型进行去偏:基于住房抵押贷款申请数据的方法比较AI 解读 ↓
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对偏差决策模型进行去偏:基于住房抵押贷款申请数据的方法比较AI 解读 ↓
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Prediction models can improve efficiency by automating decisions such as the approval of loan applications. However, they may inherit bias against protected groups from the data they are trained on. This paper adds counterfactual (simulated) ethnic bias to real data on mortgage application decisions, and shows that this bias is replicated by a machine learning model (XGBoost) even when ethnicity is not used as a predictive variable. Next, several other de-biasing methods are compared: averaging over prohibited variables, taking the most favorable prediction over prohibited variables (a novel method), and jointly minimizing errors as well as the association between predictions and prohibited variables. De-biasing can recover some of the original decisions, but the results are sensitive to whether the bias is effected through a proxy.