
Hi,
I need some help to manage frailty in Survreg function; in particular I'm looking for more information about frailty in survreg function applied to a loglogistic hazard function.
Actually I need to develope a predictor for frailty random variable realization (similar to the Proportional Hazard Model's one based on Laplace Tansforms' ratio).
I can't find any documentation about AFT models with Gamma Frailty developed in "survival package". Any reference paper to suggest? 
Thank a million
Francesca
 		 	   		  
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