This is a nice overview of how to use R to adjust survival curves in an observational study. It covers weighting and modeling with covariates and criticizes several approaches.
Terry M. Thernau
- Cynthia S. Crawson
- Elizabeth J. Atkinson. Adjusted survival curves. 2015 (January). Available at https://cran.r-project.org/web/packages/survival/vignettes/adjcurve.pdf.
