Time-Varying Restricted Mean Survival Time from Survival Matrices // Utilities for restricted mean survival time (RMST) and time- varying restricted mean survival time quantities computed from survival curves provided on a time grid. The package is model- agnostic and accepts only a time vector and survival matrices, returning RMST-based quantities and bootstrap summaries. For restricted mean survival time methodology, see Royston and Parmar (2013) doi:10.1186/1471-2288-13-152.