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st: First instance of starting and stopping drug


From   "Paul O'Brien" <paul@afe2.org.uk>
To   statalist@hsphsun2.harvard.edu
Subject   st: First instance of starting and stopping drug
Date   Thu, 13 Mar 2008 08:26:00 +0000

We have a database of patients on and off a drug in the long form,  
some stopping before starting later. I want to do a survival analysis  
on the first instance of starting and stopping use under our care, but  
have difficulty isolating the first episode of use.

Any help appreciated.

Paul

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