[R] Survival Regression with multiple records per subject

[Ronaldo Reis Junior]

Em Qua 30 Abr 2008, Fabian Hefner escreveu:
> 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.

Hi,

If I got it, the time must be converted to time to death, your table must be:

>    itm      ID     exercise      time to death
> 1.315441    1        1             6
> 1.351235    2        1             3

The problem is your itm covariate, may be it must be converted to de 
difference between the first value and the last value.

Inte
Ronaldo
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