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Re: st: Need help programming for dates in Stata


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Need help programming for dates in Stata
Date   Tue, 5 Mar 2013 19:52:13 +0000

This is not quite right. A -startdate- of 2008 or earlier is
consistent with use in 2009.

Nick

On Tue, Mar 5, 2013 at 7:38 PM,  <annebroe@gmail.com> wrote:
> replace startdate = mdy(01,01,1900) if startdate == .
> Gen used_2009 = 0
> Replace  used_2009 = 1 if startdate>=mdy(01,01,2009) & stopdate<= mdy(12,31,2009)
>
> Do the same for each Newvar
>
> Anne
>
> Den 05/03/2013 kl. 18.43 skrev Michael Stewart <michaelstewartresearch@gmail.com>:
>
>> Hi
>>
>> 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
>> used_2012
>>
>> 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
>>
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