[R] command in survival package

[Thomas Lumley]

On Fri, 20 Jan 2006, Linda Lei wrote:

> Hi there,
>
>
>
> I have a question about one command sentence when I follow the example
> in the book of "Survival analysis in S":
>
> > aml1<-aml[aml$group==1]

If this is really what the book says you should probably complain to the 
author.  However, if it says
   aml1<-aml[aml$group==1,]
then you show type that instead.

It is hard to be sure, because you don't say where the `aml' data set 
comes from.  It can't be the one in the survival package as this doesn't 
have a variable called "group"

>
> Thus, I couldn't keep going on the next command:
>
> esf.fit<-survfit(Surv(aml1,status)~1).
>

This looks implausible as well. I would have expected something like
   esf.fit<-survfit(Surv(time,status)~1, data=aml1)


 	-thomas