Hello,
I put my data in conditional counting process format basically by adding
a stratum variable to distinguish between observations.
I fit a model and then used survfit function. These are the first five lines
of
output.
time n.risk n.event survival std.err lower 95% CI upper 95% CI
849 11 1 9.22e-01 7.53e-02 7.85e-01 1.000000
3025 28 1 8.91e-01 7.87e-02 7.50e-01 1.000000
3089 28 1 8.62e-01 8.14e-02 7.16e-01 1.000000
4691 37 1 8.39e-01 8.23e-02 6.92e-01 1.000000
5295 43 1 8.21e-01 8.26e-02 6.74e-01 0.999566
My questions:
1. How does it determine n.risk at time t?
2. How does it calculate the survival at the end of time t?
thank you!
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