Hello all:

I'm having some difficulty interpreting the results of a Cox
proportional hazards analysis that I recently performed. I
am running the fit with a fixed categorical variable (Treatment) and a
nested categorical variable (Chamber) within Treatment. The likelihood
ratio tests of both of these effects have a low p (<0.001), but I am
unable to discern which specific treatments (or chambers) are
statistically different from one another.  I was wondering if there
are any aposteriori or post-hoc tests that are performed in relation
to proportional hazards analysis and can help pinpoint which
treatments are responsible for these results.

My experience with proportional hazards tests is minimal, so if I need
to provide more details, please let me know.

Thanks for any help.

Justin

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