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st: Someone help me on the multiple failure duration model?


From   "Martin Wang" <zwang215@gmail.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: Someone help me on the multiple failure duration model?
Date   Mon, 3 Nov 2008 23:21:42 +0800

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Dear all, 

Can someone help me on the multiple failure duration model? For example, let's say I have the following data:


year             |       1        |         2        |        3         |       4         |       5          |       6         |      7                  
patient 1(Female)|weight:50,ill(0)| weight:52,ill(0) | weight:53,fine(1)|weight:48,fine(1)|weight:50,ill(0)  |weight:50,ill(0) |weight:50,ill(0)
patient 2(male)  |weight:51,ill(0)| weight:48,ill(0) | weight:60,ill(0) | weight:67,ill(0)|weight:78,fine(1) |weight:60,fine(1)| (missing)  
patient 3(male)  |weight:52,ill(0)| weight:50,fine(1)| (missing)        | (missing)       | weight:50,fine(1)| weight:40,ill(0)| weight:60,ill(0) 


You see for each patient there are multiple observations, and also there may be multiple failures(in this case - getting fine). And also some subject has gap in the data, for example patient 3 has gap in year 3 and year 4. I wonder whether I can still use streg or stcox for this setting and use ALL the observations. For example,

*****************************************************
stset t, id(patient) failure(fine) exit(time .) noshow
stcox weight female, r 
or streg weight female, r
*****************************************************
Can anyone kindly help me out? Any suggestions?

Many thanks!!

Martin

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