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| From | Steven Samuels <sjsamuels@gmail.com> |
| To | statalist@hsphsun2.harvard.edu |
| Subject | Re: st: Re: survival analysis with unknown censoring |
| Date | Wed, 13 Apr 2011 11:35:39 -0400 |
Dear Leo: I believe you are referring to a post by Stefan Wagner at http://www.stata.com/statalist/archive/2010-09/msg00290.html. I responded to that post http://www.stata.com/statalist/archive/2010-09/msg00429.html In Stefan's case there were two types of failure, but he observed only one. I can't tell for sure from your question whether you have the same problem, but I don't think so. I believe that you have four types of firms; please correct me if I am wrong. All enter in 1988 and observation ends in 2008. 1. Those that have no failures in the study period 2. Those that have one failure in the study period but do not re-enter. 3. Those that have one failure, re-enter at a later date, then fail a second time in the study period 4. Those that have one failure, re-enter at a later date, but do not fail by the end of the study period We would nee to see an example of the real data for one firm of each type, including whatever dates you had, with your actual variable names (not made-up names like "dep.var") Regards, Steve Steven J. Samuels Consultant in Statistics 18 Cantine's Island Saugerties, NY 12477 USA Voice: 845-246-0774 Fax: 206-202-4783 sjsamuels@gmail.com On Apr 5, 2011, at 11:25 AM, lquadros wrote: Dear Mr. Wagner, All dates in my data is known (1988-2008). However, there are no failures in the period of analysis for some firms, while other firms have just one observation and fail. My doubt is the time duration of the observations that do not fail. In Stata, firms are without any value in the cases there are no failure. However when I run stset time, failure(dep.var) id(idfirm), the message "PROBABLE ERROR" appears. As my goal is to study the second entry in the market, for firms that have just one observation and did not fail NO value is related to them, while firms that have a failure in the first event has the value "zero". And if the second event is a failure it has value "1". Please, should I run other commands to avoid probable errors? Am I using the right values for the circumstances that I mentioned? Thank you very much. Leo Quadros Universidad Autonoma de Barcelona -- View this message in context: http://statalist.1588530.n2.nabble.com/survival-analysis-with-unknown-censoring-tp5514015p6242690.html Sent from the Statalist mailing list archive at Nabble.com. * * 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/ * * 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/