[R] Creating a survival object with and without an event indicator
wwreith
reith_william at bah.com
Thu May 3 14:57:56 CEST 2012
When reading about surv(). I saw the following statement "Although unusual,
the event indicator can be omitted, in which case all subjects are assumed
to have an event."
So I tried the following
1. survobj<-surv(mydata$Time) vs. 2. survobj<-surv(mydata$Time,
mydata$Event)
where mydata$Event is a column of all ones. I did not get the same answer
when I ran survreg(survobj~shift, data=mydata) on each. The second case
actually failed to converge. I then tried a column of all zeros just to make
sure I wasn't misreading something but still got the warning message failed
to converge.
Can anyone explain what exactly R is doing for case 1?
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