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risklimits
2008 Dec 04
1
comparing SAS and R survival analysis with time-dependent covariates
...3.236:
data trythis;
input id days timedeli stat;
datalines;
1 3 .5 1
2 1.5 1 1
3 6 1000 0
4 8 1000 1
5 8 1 0
6 21 1000 1
7 11 3 1
run;
proc phreg data=trythis;
model days*stat(0)=deli/risklimits ties=exact;
if timedeli>days then deli=0; else deli=1;
run;
Example (continued). R gives HR=3.91:
tmp = data.frame(id=c(1, 1, 2, 2, 3, 4, 5, 5, 6, 7, 7), start=c(0.0,
0.5, 0.0, 1.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 3.0), end=c(0.5, 3.0,
1.0, 1.5, 6.0, 8.0, 1.0, 8.0, 21.0, 3.0, 11.0...