Estimation of the Proportion of Treatment Effect Explained by Surrogate Outcome Information

Estimates the proportion of treatment effect on a censored primary outcome that is explained by the treatment effect on a censored surrogate outcome/event. All methods are described in detail in Parast, et al (2020) "Assessing the Value of a Censored Surrogate Outcome" and Wang et al (2025) "Model-free Approach to Evaluate a Censored Intermediate Outcome as a Surrogate for Overall Survival" . A tutorial for this package can be found at < https://www.laylaparast.com/surrogateoutcome>.