hetsurrSurv is an R package to assess and test for heterogeneity in the utility of a surrogate marker with respect to a baseline covariate using censored (survival data), and to test for heterogeneity across multiple time points.
More details on the method are available in Parast, L., Tian, L & Cai, T. (2024). Assessing Heterogeneity in Surrogacy Using Censored Data. Statistics in Medicine, 43(17): 3184-3209, doi:10.1002/sim.10122.
Go here to view a tutorial for this package: hetsurrSurv Tutorial. We also have a Shiny app here: hetsurrSurv Shiny App.