Hello,
this is maybe a trivial question for some of you:
how does stata account for the presence of repeated spells?
I know that, in order to account for different spells that refers to
the same unit, stata requires to specify the id( ) option when the
data are stset-ted. But my question is about how stata deals with this
problem in the estimation.
For instance, suppose the contribution to the loglikelihood (with
right censoring) is given by:
L(i)= c log h(t)+log S(t)
where c is a censoring variable (c=1 if spell is complete), h is the
hazard function and S the survival function.
How the contribution to the likelihood changes when unit i has
repeated spells? In my case this is relevant because I have to program
the likelihood function by myself.
Many thanks,
Vinicio
*
* 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/
