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| From | Maarten Buis <maartenlbuis@gmail.com> |
| To | statalist@hsphsun2.harvard.edu |
| Subject | Re: st: Cox model with Conditional Frailty AND Stratification |
| Date | Thu, 18 Aug 2011 09:31:12 +0200 |
On Thu, Aug 18, 2011 at 5:43 AM, Jana von Stein wrote: > I am trying to specify a Cox model with Conditional Frailty (as in > Box-Steffensmeier et al. 2007) along with stratification. Does anyone know > how to do both? The error message seems pretty clear: "option strata(varname) not allowed for shared frailty models". This makes perfect sense if the stratification variable and the id variable for shared frailty are the same. That model would just not be identified as the stratification would take care of all variance that the shared frailty might otherwise pick up. If the stratification variable and id variable differ, the model may be in theory identified, but I would not be surprised if in practice most datasets just would not contain enough information for it to converge. Hope this helps, Maarten Note that the Statalist FAQ also asks you to provide full references: See the second item of section 3.4 Consider other members <http://www.stata.com/support/faqs/res/statalist.html#others>. -------------------------- Maarten L. Buis Institut fuer Soziologie Universitaet Tuebingen Wilhelmstrasse 36 72074 Tuebingen Germany http://www.maartenbuis.nl -------------------------- * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/