problem with Surv

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.

Regards,
Richie.

Mathematical Sciences Unit
HSL



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