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From: sas analysis on 12 Apr 2010 19:45
Hi All,

I have a longitudinal dataset and would like to make sure if I am
setting it correctly to run proc lifetests and phreg for each
subject.. This is how my dataset looks:

id outcome time Exposure x Exposure Y
1 0 0.6
1 0 1.1
1 1 1.6
1 0 0.5
2 0 1
2 0 1.6
2 0 2
2 0 2.5
3 1 0.6
3 0 1.1
3 0 1.6
4 0 2
4 1 1
4 0 1.5

The code I am using now is:

proc lifetest data=x plots=survival;
time TIME*outcome(0);
id id;
strata exposurex;
run;

and for the Phreg:
proc phreg data=x;
model TIME*outcome(0)=exposure x/risklimits;
id id;
run;

Can anyone confirm if this is correct? Is sas reading all observation
to time?

Thanks!!
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