[R] cox model

[Jeff Newmiller]

Stop re-posting this question.  It only irritates people... it does not improve your chances of getting help.

What does improve your chances is reading the Posting Guide and following the advice given there. Your question amounts to asking someone to figure out what theory you should apply to a problem domain... which is not really on topic here, though someone might recommend something to you anyway.

The better strategy would be to seek out (elsewhere) what textbook/papers you want to apply (SAS should suggest references if they claim to implement solutions) and then use Google or rseek.org to find contributed packages that implement some or all of the steps in that approach. You can also peruse the Task Views on CRAN. When you get error messages trying to apply those tools in R, ask here how to resolve those problems, since this list is about the language not your problem domain.

On November 3, 2018 12:51:23 PM PDT, Medic <mailipadpost using gmail.com> wrote:
>I need a R-code for a situation that is well described in the sas help.
>I
>would be very grateful for the help!
>"Time-dependent variables can be used to model the effects of subjects
>transferring from one treatment group to another. One example of the
>need
>for such strategies is the Stanford heart transplant program. Patients
>are
>accepted if physicians judge them suitable for heart transplant. Then,
>when
>a donor becomes available, physicians choose transplant recipients
>according to various medical criteria. A patient’s status can be
>changed
>during the study from waiting for a transplant to being a transplant
>recipient. Transplant status can be defined by the time-dependent
>covariate
>function z=z(t) as:
>z(t)= 0 (if the patient has not received the transplant at time t)
>and 1 (if has received)
>
>______________________________________________
>R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see
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>PLEASE do read the posting guide
>http://www.R-project.org/posting-guide.html
>and provide commented, minimal, self-contained, reproducible code.

-- 
Sent from my phone. Please excuse my brevity.