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2006 Jan 20
3
command in survival package
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$group==1]
but I got the error warning: NULL data frame with 23 rows
Thus, I couldn't keep going on the next command:
esf.fit<-survfit(Surv(aml1,status)~1).
and also when I try
> aml1<-aml[aml$group==1,]