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
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