3 papers
stat.ME2026
Toward Efficient Estimation of Regional Treatment Effects in Multi-Regional Clinical Trials
Zhiwei Zhang, Yongwu Shao, Wei Zhang +1
A multi-regional clinical trial (MRCT) is a single clinical trial conducted in multiple regions simultaneously under a common protocol, which may be used to support parallel submis…
stat.ME2025
Variance Estimation for the Inverse Probability of Treatment Weighted Kaplan Meier Estimator
Zhiwei Zhang, Yongwu Shao, Zhishen Ye
In a widely cited paper, Xie and Liu (henceforth XL) proposed to use inverse probability of treatment weighting (IPTW) to account for possible confounding in observational studies…
stat.ME2025
Likelihood confidence intervals for misspecified Cox models
Yongwu Shao, Xu Guo
The robust Wald confidence interval (CI) for the Cox model is commonly used when the model may be misspecified or when weights are applied. However it can perform poorly when there…