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stat.ME2026
The Missing Corner: When Sharp Causal Bounds Fail to Compose
Yicheng Qi, Xiyi Xiong
Sharp bounds on two potential-outcome means need not combine into sharp bounds on their difference. We characterize exactly when composition is guaranteed across environments shari…
stat.ME2026
Same Predictions, Different Harms: Causal Auditing of Patient World Models
Yicheng Qi, Xiyi Xiong
Patient world models used for clinical trial simulation can agree on transition kernels and arm-specific risks, yet disagree on the fraction of patients harmed by switching treatme…