You will have to be more clear about what exactly you are trying to do.
I, at least, am quite unsure about what you want.
fit <- coxph(Surv(time, status) ~ x1 + strata(x2))
The hazard ratio(s) wrt x1 have the same meaning for a stratified or an
unstratified model. If you are asking about hazard ratios for x2 --- there
are
none. That is the point of a strata; you are declaring a variable to NOT be
proportional hazards, and thus there is no single "hazard ratio" that describes
it.
Terry Therneau
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