[R] Stratified Cox proportional Hazard Model

[Dora Ilieva]

Hello everyone,

I am a new user of R. Does anybody know how hazard ratios are extracted
for each factor level in a stratified Cox proportional hazard
regression model? I have a cancer data set where the variable
?differentiation? is a factor with three levels: poor, intermediate and
good. I would like to extract the hazard ratio for each grade level and
relate it to another prognostic factor. I?ll appreciate very much if
somebody helps me sort out this.

Sincerely,
Dora