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st: Frailty gamma or inv gaussian distribution


From   Alexander James <alexandre_lille-paris@hotmail.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Frailty gamma or inv gaussian distribution
Date   Tue, 11 Sep 2012 16:25:54 -0300

Dear Statalist members,

I am trying to run a survival model. I am facing an issue regarding how I should set the frailty. When I use gamma distribution I get very significant, but when I try to run it with inverter Gaussian distribution the level of significance of my main explanatory variable reduces substantially. I could not find any test to indicate which of them is more appropriate or a reference to explain why I am observing the chance in significance level. Would someone have a suggestion for this question? 

the command I am using:

streg variable1 variable2 variable3, time distribution(ex)  frailty(gamm) shared(id_firm)

Alexandre

ps. I am using an exponential model 		 	   		  
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