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Flexible parametric models for timetoevent data, including the RoystonParmar spline model, generalized gamma and generalized F distributions. Any userdefined parametric distribution can be fitted, given at least an R function defining the probability density or hazard. There are also tools for fitting and predicting from fully parametric multistate models.
Package details 


Author  Christopher Jackson [aut, cre], Paul Metcalfe [ctb], Jordan Amdahl [ctb] 
Maintainer  Christopher Jackson <chris.jackson@mrcbsu.cam.ac.uk> 
License  GPL (>= 2) 
Version  1.1.1 
URL  https://github.com/chjackson/flexsurvdev 
Package repository  View on CRAN 
Installation 
Install the latest version of this package by entering the following in R:

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