[R] Coxph

Heinz Tuechler
Tue, 11 Jul 2006 10:52:38 -0000

>From the help page of Surv:
"Although unusual, the event indicator can be omitted, in which case all
subjects are assumed to have an event."

That means, you can use coxph that way, _but_ it depends on your model.
Do you really want to model the time on study regardless of the kind of event?

Greetings,
Heinz T?chler

At 12:22 11.07.2006 +0200, Sharon.Mazurel at ing.com
wrote:
>
>
>Dear all,
>
>
>
>My question is:
>
>In the Surv object you have two arguments, "time" and
"event". I have
>two events, namely withdrawn and success.
>I use no event or status argument in "Surv" because all my objects
"die"
>in my data set.
>
>Does coxph function calculate the coefficients correctly when you put no
>"event" argument into the Surv object?
>
>Thus:
>
>Coxph(Surv(duration)~covariates,data=data) duration=duration of the deal
>
>Duration: is the time till one subject fails or succeed in my research.
>
>Can somebody help me?
>
>
>Best regards,
>
>
>Sharon Mazurel
>
>
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