Nothing
The main function is icweib, which fits a stratified Weibull proportional hazards model for left censored, right censored, interval censored, and noncensored survival data. We parameterize the Weibull regression model so that it allows a stratumspecific baseline hazard function, but where the effects of other covariates are assumed to be constant across strata.
Package details 


Author  Xiangdong Gu and Raji Balasubramanian 
Date of publication  20130715 07:27:13 
Maintainer  Xiangdong Gu <xdgu@schoolph.umass.edu> 
License  GPL (>= 2) 
Version  1.0 
Package repository  View on CRAN 
Installation 
Install the latest version of this package by entering the following in R:

Any scripts or data that you put into this service are public.
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.