[R] Kaplan Meier Post Hoc?

Marc Schwartz marc_schwartz at me.com
Thu Oct 25 00:00:49 CEST 2012

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.


Marc Schwartz

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