There are two main parts of this package: 1) Predictions about the required number of events in a 2arm survival study from a fixed set of parameters, 2) Predictions about the time when reaching a target level of events from accumulated data analysed at an interim in a blinded survival study. 1) uses an exponential or Weibull model for survival and accrual according to a fixed non linear function. 2) by default uses a Weibull model for survival and either a Poisson process or a nonlinear function for accrual. This package is based on earlier work by Christophe Delong and Sally Hollis.
Package details 


Author  Daniel Dalevi and Nik Burkoff with contributions from Helen Mann, Paul Metcalfe and David Ruau 
Maintainer  Daniel Dalevi <daniel.dalevi@astrazeneca.com> 
License  GPL (>=2) 
Version  2.4.1 
Package repository  View on GitHub 
Installation 
Install the latest version of this package by entering the following in R:

Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.