Re: [R] Use of survreg.distributions

From: Abdus Sattar <upsattar_at_yahoo.com>
Date: Thu, 24 Apr 2008 19:21:58 -0700 (PDT)


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_at_yahoo.com


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