[R] problem with Surv

Richard.Cotton at hsl.gov.uk Richard.Cotton at hsl.gov.uk
Mon Dec 15 14:54:51 CET 2008

> I'm trying to estimate a tobit model with  survrec function. I use 
> the following code : 
> reg<-survreg(Surv(crs_prod,crs_prod<=1)~SOLVA+log(AF088)
> +HHI+ACTIONNA,data=dat,dist="gaussian")
> I get this error message with R 2.7.2 
> Error in survreg(Surv(crs_prod, crs_prod <= 1) ~ SOLVA + log(AF088) +  : 

>   Response must be a survival object

Take a look at Surv(crs_prod, crs_prod <= 1).  Your example isn't 
reproducible (tut tut), but if I had to guess, I'd say that this is NULL, 
because crs_prod is column in dat, and Surv can't find it.


Mathematical Sciences Unit


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