3 papers
stat.ME2026
Minimum Wasserstein distance estimator under covariate shift: closed-form, super-efficiency and irregularity
Junjun Lang, Qiong Zhang, Yukun Liu
Covariate shift arises when covariate distributions differ between source and target populations while the conditional distribution of the response remains invariant, and it underl…
math.ST2025
Unsupervised optimal deep transfer learning for classification under general conditional shift
Junjun Lang, Yukun Liu
Classifiers trained solely on labeled source data may yield misleading results when applied to unlabeled target data drawn from a different distribution. Transfer learning can rect…
math.ST2024
Efficient estimation of partially linear additive Cox models and variance estimation under shape restrictions
Junjun Lang, Yukun Liu, Jing Qin
Shape-restricted inferences have exhibited empirical success in various applications with survival data. However, certain works fall short in providing a rigorous theoretical justi…