Survival Analysis with Subject-Specific (Case Weights) and Time- Dependent Weighting // Provides survival analysis functions with support for time-dependent and subject-specific (e.g., propensity score) weighting. Implements weighted estimation for Cox models, Kaplan-Meier survival curves, and treatment differences with point-wise and simultaneous confidence bands. Includes restricted mean survival time (RMST) comparisons evaluated across all potential truncation times with both point-wise and simultaneous confidence bands. See Cole, S. R. Hernn, M. A. (2004) doi:10.1016/j.cmpb.2003.10.004 for methodological background.