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st: Need help programming for dates in Stata

From   Michael Stewart <>
To   statalist <>
Subject   st: Need help programming for dates in Stata
Date   Tue, 5 Mar 2013 13:43:55 -0500


I have a list of start and stop dates for medications
I am trying to find if there is way to classify  them to specifically
say if they are used in particular years

Med  Start date    Stopdate
xxx    11/12/2009    11/12/2012
yyy      .               1/2/2010
zzz    1/1/2009      .

I want to create four  variables Used_2009   used_2010    used_2011

The criteria is
1)If medication is  used even for a day in a year, it is considered to
be used for that year
2)If the start date is blank, then it is deemed to be used from a much
prior day
3)If ending date is blank/missing then  that medication is currently active

Thank you ,
Yours Sincerely,
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