[R] How does the survfit.coxph calculate the survival value?

[koshihaku]

Thank you very much!

I am analyzing software stress test data using R, and fiting data by coxph.
I think the survfit.coxph can give the estimated baseline survival S_0(t_i),
and we can calculated the survival S(t_i) by using S_0(t_i) and the x(t_i). 

Then can I use the function lambda={S(t_(i-1))-S(t_i)}/S(t_(i-1)) to
calculate the hazard at time t_i ?

Koshihaku

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