R help - Dec 2013 - cure fraction model

Dear all, is there an R function to simulate random observations from a cure
fraction model (random observations with long-term survivos).
Some references how can I do this will be welcome.

Best Regards
ML 		 	   		  
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On Dec 19, 2013, at 5:32 AM, L... L... wrote:
> Dear all, is there an R function to simulate random observations from a
cure fraction model (random observations with long-term survivos).
> Some references how can I do this will be welcome.
> 
Shouldn't be too hard to set up a mixture of weibull distributed event times
with one component having a parameter less than "exponential" (to
represent the cured fraction with survival typical of an average human
population) and another with a hazard like an "exponential" or worse
to represent the non-cured fraction. Watch out about how the shape parameters
are defined. The survival package uses different parameterization than the
rweibull definitions.

library(survival)
?survreg
?rweibull

-- 

David Winsemius
Alameda, CA, USA