Dear Stata users,
I am working on a event history analysis and struggling with some
problems. I would be really thankful for any suggestions.
My original dataset has simplified the following structure:
Case-Nr. Birth Death Entry1 Exit1 Entry2 Exit2
1 0 100 0 90
2 10 80 10 60 10 70
3 30 150 30 120
I would like to analyse, if exits influence the mortality risk of a
subject. For answering this question, I do an episode splitting. I do
this, by defining a variable "Event" which has the value "1" if an exit
happened to a subject. The episodes were split by the command:
"expand 2 if event"
As long as I have only one entry and exit-event, this works well for my
data and looks as follows:
Newid Birth Death Entry1 Exit1 event afterevent ts t1 dummydeath
1 0 100 0 90 1 0 0 90 0
1 0 100 0 90 1 1 90 100 1
3 30 150 30 120 1 0 30 120 0
3 30 150 30 120 1 1 120 150 1
4 0 100 30 100 0 0 0 100 1
The variable "ts" describes the start, "t1" the end of each episode.
"Afterevent" is a dummy which tells if an exit-event happened in the
episode and "dummydeath" in general tells if a subject died. (this is a
very simplified example)
After that, I am able to stset the data:
"stset t1, failure(dummy_death=1) id(newid)"
and than analyse potential effects:
"streg afterevent, dist(weibull) nohr"
My question is: How can I split cases in which 2 and more exit-events
happened (like for example for Case-Nr.2)?
Again, thank you for your answers.
Simon
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