Dear R-user: 
 
I am using survreg(Surv()) for fitting a Tobit model of left-censored longitudinal data. For logarithmic transformation of y data, I am trying use survreg.distributions in the following way: 
tfit=survreg(Surv(y, y>=-5, type="left")~x + cluster(id), dist="gaussian", data=y.data, scale=0, weights=w) 
my.gaussian<-survreg.distributions$gaussian
my.gaussian$name="lognormal"
my.gaussian$dist<-my.gaussian
tfit=survreg(Surv(y, y>=-5, type="left")~x + cluster(id), dist=my.gaussian, data=y.data, scale=0, weights=w) 
 
If I run these codes then I got the following error message, 
 
Error in survreg(Surv(y, y >= -5, type = "left") ~ x +  :
Invalid distribution object

Does anybody can help me in identifying the error(s) in these code please? 
 
Advance thanks for your time. 
 
Abdus Sattar
upsattar@yahoo.com 


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