Effect or Treatment Heterogeneity? Policy Evaluation with Aggregated and Disaggregated Treatments
效应异质性还是处理异质性?聚合与细分处理的政策评估AI 解读 ↓
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效应异质性还是处理异质性?聚合与细分处理的政策评估AI 解读 ↓
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Binary treatments are often ex-post aggregates of multiple treatments or can be disaggregated into multiple treatment versions. Thus, effects can be heterogeneous due to either effect or treatment heterogeneity. We propose a decomposition method that uncovers masked heterogeneity, avoids spurious discoveries, and evaluates treatment assignment quality. The estimation and inference procedure based on double/debiased machine learning allows for high-dimensional confounding, many treatments and extreme propensity scores. Our applications suggest that heterogeneous effects of smoking on birthweight are partially due to different smoking intensities and that gender gaps in Job Corps effectiveness are largely explained by differential selection into vocational training.