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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 19:42:23 +0000

Nice.

Nick

On Tue, Mar 5, 2013 at 7:39 PM, Jeph Herrin <stata@spandrel.net> wrote:
>
> forv y=2009/2012 {
>    gen used_`y'= inrange(`y',yofd(startdate),yofd(stopdate))
>
> }
>
>
>
> On 3/5/2013 1:43 PM, Michael Stewart wrote:
>>
>> 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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