Rank-Based Test to Evaluate a Surrogate Marker

Uses a novel rank-based nonparametric approach to evaluate a surrogate marker in a small sample size setting. Details are described in Parast et al (2024) , in Hughes A et al (2025) , and in Hughes A et al (2026) . A tutorial for this package can be found at < https://www.laylaparast.com/surrogaterank> and a Shiny App implementing the package can be found at < https://parastlab.shinyapps.io/SurrogateRankApp/>.