[R] Survival Regression with multiple records per subject

[Dimitris Rizopoulos]

If 'itm' is a covariate with measurement error, then you could also 
have a look at the 'JM' package.

I hope it helps.

Best,
Dimitris

----
Dimitris Rizopoulos
Biostatistical Centre
School of Public Health
Catholic University of Leuven

Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/(0)16/336899
Fax: +32/(0)16/337015
Web: http://med.kuleuven.be/biostat/
     http://www.student.kuleuven.be/~m0390867/dimitris.htm


----- Original Message ----- 
From: "Fabian Hefner" <fabian-hefner at web.de>
To: "'Terry Therneau'" <therneau at mayo.edu>
Cc: <r-help at r-project.org>
Sent: Wednesday, April 30, 2008 1:25 PM
Subject: [R] Survival Regression with multiple records per subject


> Dear R users!
>
> I reformulate the question with another example perhaps my question 
> will be
> more clearly now.
>
> I have several subjects. One subject has multiple records. Only a 
> starting
> point exists the end point is vague.
> Here is an example:
>
>   itm      ID     exercise      time
> 1.401869    1        0             1
> 1.324390    1        0             2
> 1.324390    1        0             3
> 1.333338    1        0             4
> 1.346761    1        0             5
> 1.315441    1        1             6
> 1.337812    2        0             1
> 1.319915    2        0             2
> 1.351235    2        1             3
> itm is the covariate;
> ID is the subject Id;
> exercise indicates if the subject is dead=1 or alive=0
>
> How can I allocate the multiple records to one subject (for example 
> record
> 1-6 are part of subject with ID 1 record 7-9 are part of subject 
> with ID2)
> and process a survival regression.
>
> the "survRegData <- survreg(formula=Surv(time,exercise)~itm, 
> data=Data,
> dist="weibull")" command doesn't take into account that multiple 
> records are
> part of one subject.
>
> Many thanks!
>
> Fabian Hefner
>
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