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From | Grethe Søndergaard <dkstatstata@gmail.com> |
To | statalist@hsphsun2.harvard.edu |
Subject | st: Stratified cox regression: How many indivduals contribute to the analysis |
Date | Thu, 7 Apr 2011 15:00:45 +0200 |
Hi, I am analysing my data using a stratified cox regression model. I use a sibling statum variable, taking the same value for individuals who are full siblings. The individuals in the data set have between 1 and 5 full siblings. (Variables in the data set): Person_ID Father_ID Mother_ID Exposure Outcome Number_of_siblings ... Only siblings who discordant on exposure and where at least one of them experiences the outcome contribute to the analysis. Is there a way to find out how many of the siblings in my data that contribute – e.g. by using “expand”? Thank you * * 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/