Causal Inference with Truncation-by-Death and Unmeasured Confounding
死亡截断与未测混杂下的因果推断AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要以死亡截断、主分层、未测混杂及存活者平均因果效应为核心,并提出识别与双重稳健估计,因此归入因果推断。
死亡截断与未测混杂下的因果推断AI 解读 ↓
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Clinical studies sometimes encounter truncation by death, rendering outcomes undefined. Statistical analysis based solely on observed survivors may give biased results because the characteristics of survivors differ between treatment groups. By principal stratification, the survivor average causal effect was proposed as a causal estimand defined in always-survivors. However, this estimand is not identifiable when there is unmeasured confounding between the treatment assignment and survival or outcome process. In this paper, we consider the comparison between an aggressive treatment and a conservative treatment with monotonicity on survival. First, we show that the survivor average causal effect on the conservative treatment is identifiable based on a substitutional variable under appropriate assumptions, even when the treatment assignment is not ignorable. Next, we propose an augmented inverse probability weighting (AIPW) type estimator for this estimand with double robustness. Finally, large sample properties of this estimator are established. The proposed method is applied to investigate the effect of allogeneic stem cell transplantation types on leukemia relapse.