Statalist


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

RE: st: Survival between groups


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   RE: st: Survival between groups
Date   Fri, 22 May 2009 18:14:29 +0000 (GMT)

--- On Fri, 22/5/09, Hugh Robinson wrote:
> I had stset the data using date as the time variable. 
> 
> 
> stset date1, id(lion_id) failure(event==3) enter(event==1)
> origin (time d(01Jan1998)) exit(time d(01Jan2007))
> 
> Group 1 is part of the analysis from Jan 1 2001 to Jan 1
> 2005 Group 2 Jan 1 2005 to Jan 1 2007.
> 
> Are you suggesting I add a new time variable for each
> group?  Can I do that with stsplit?

No, in your case, the lions become at risk in either 
02Jan2005 or 01Jan2007, so if your way of setting the 
data makes that happen then you are fine. 

Whether that is what happens in your case I can't see, that
depends on the structure of your data, and in particular if
the event variable correctly specifies when a lion becomes
at risk. 

-- Maarten

-----------------------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany

http://home.fsw.vu.nl/m.buis/
-----------------------------------------


      

*
*   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/



© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index