[R] Hazard ratio

[Ashta]

Hi all,

I want to calculate  hazard  ratio within each covariate


Example, one covariate has 3 classes (1,2 and 3) and x2 has 2 classes

I want to compare the relative risk ratio within each class of the covariate.
 How do I get this result ? .


The other question is that how do I interpret  the second column in
the second panel  (i.e., exp(-coef))

I used the model
coxfit1 <- coxph(Surv(sdat$time, sdat$cens)~ y1+x2)

           coef       exp(coef)  se(coef)       z          Pr(>|z|)
y1    -0.024084  0.976204  0.003077 -7.828 5.00e-15 ***
x2     0.036161  1.036822  0.083921  0.431   0.6665

         exp(coef)  exp(-coef)   lower .95    upper .95
 y1      0.9762     1.0244       0.9703         0.9821
x2      1.0368      0.9645       0.8796         1.2222


Thanks in advance