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| From | "Stephen P. Jenkins" <stephenj@essex.ac.uk> |
| To | <statalist@hsphsun2.harvard.edu> |
| Subject | st: Discrete time hazard model - Interval width |
| Date | Wed, 19 May 2010 09:30:24 +0100 |
------------------------------ Date: Tue, 18 May 2010 14:51:22 +0200 From: gideluca@unical.it Subject: st: Discrete time hazard model - Interval width Dear Stata Users, We are assessing the transition from university to the first real job, taking into account individual characteristics and the family background. We use survey data including graduates from the summer sessions in the year 2004 who were interviewed at one, three and five years from graduation. In order to carry out the analysis we estimate a discrete time hazard model. We have organised the data in such a way that for each student there are as many data rows as there are time intervals over which the student is at risk of finding the first job. Is it correct to use intervals of different width (0-1; 1-3; 3-5) given that we do not have yearly interviews? +-----------------------+ id studytim dead ----------------------- 279. 182 2 0 280. 182 2 1 281. 183 3 0 282. 183 3 0 283. 183 3 1 ----------------------- 284. 184 1 1 285. 185 3 0 286. 185 3 0 287. 185 3 1 288. 186 3 0 ----------------------- 289. 186 3 0 290. 186 3 0 +-----------------------+ Thank you very much. Giuliana ======================== Thanks to Steve Samuels for the mention of my Survival Analysis website materials in connection with this topic. FYI The webpages now have a new 'permanent' URL, as given in my signature. The URL Steve mentioned will continue to work, but might not in future. Giuliana: if the intervals of equal width, there is no problem. If you have unequal-width intervals, then ideally you should take account of this. It may be complicated to do so. However, do have a look at -intcens- on SSC for some models that do allow for unequal-width intervals. Stephen ------------------------------------- Professor Stephen P. Jenkins <stephenj@essex.ac.uk> Institute for Social and Economic Research (ISER) University of Essex, Colchester CO4 3SQ, UK Tel: +44(0)1206 873374. Fax: +44(0)1206 873151 http://www.iser.essex.ac.uk Survival Analysis using Stata: http://www.iser.essex.ac.uk/survival-analysis Downloadable papers and software: http://ideas.repec.org/e/pje7.html * * 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/