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st: Cox regression, one observation


From   Lee Savage <leemsavage@yahoo.co.uk>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: Cox regression, one observation
Date   Thu, 13 Jun 2013 21:41:53 +0100 (BST)

I am running a survival analysis consisting of a dataset with 73 subjects. My duration time is months and three of my cases have durations of just one month meaning that their observed entry and exit is in the same row of the dataset. These cases are seemingly being excluded from the model as stset for the cases is _t=1 and _t0=0. My question is can I do anything to try and include these cases in the model or does survival analysis require that each case has at least two observations to be included?


Thanks

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