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From | Shervin Shirvani <shervin.shirvani@gmail.com> |
To | statalist@hsphsun2.harvard.edu |
Subject | st: Fwd: Disagreement among Proportional Hazards Assumption Tests |
Date | Thu, 15 Aug 2013 09:49:46 -0700 |
Hi Statalisters, I wondered if there was a situation wherein survival curves cross and yet the proportional hazards assumption still holds (or at least does not require any sort of correction). I am conducting a retrospective analysis wherein my treatment and unexposed groups both have fairly shallow survival curves that cross about half-way along the x-axis. As it happens, analytic tests for the proportional hazards assumption (i.e., including a time-varying covariate, Schoenfeld residuals using estat phtest, etc) do not yield a significant result. Are the initial results (i.e. without adjustment for the curves crossing) reportable as they are? Thanks! * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/