[R] command in survival package

From: Linda Lei <llei_at_bccrc.ca>
Date: Sat 21 Jan 2006 - 09:28:31 EST


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,]

> aml1
 

I got  

[1] time status x

<0 rows> (or 0-length row.names)    

Could you please help me with these questions? I'm stuck here. Thank you very much!  

Cheers,

Linda

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