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Kaplan Meier Post Hoc?
2 messages · Charles Determan Jr, Marc Schwartz
On Oct 24, 2012, at 4:33 PM, Charles Determan Jr <deter088 at umn.edu> wrote:
This is more of a general question without data. After doing 'survdiff', from the 'survival' package, on strata including four groups (so 4 curves on a Kaplan Meier curve) you get a chi squared p-value whether to reject the null hypothesis or not. Is there a method to followup with pairwise testing on the respective groups? I have searched the library but have come up with nothing. Perhaps I am mistaken in something here. Regards, Charles
Take a look at ?p.adjust, which provides a generic framework for multiple pairwise comparison adjustment methods. The most conservative, but not always the best approach, would of course be Bonferroni. Regards, Marc Schwartz