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Re: st: Need help programming for dates in Stata


From   Michael Stewart <michaelstewartresearch@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Need help programming for dates in Stata
Date   Tue, 5 Mar 2013 14:47:41 -0500

HI
Thank you for so many responses
I will go through them all and let you know
The reason I didnt put my code .. I was hopelessly lost
I fiddled with using inrange and inlist commands but was going nowhere.

Thanks
Mike

On Tue, Mar 5, 2013 at 2:42 PM, Nick Cox <njcoxstata@gmail.com> wrote:
> 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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-- 
Thank you ,
Yours Sincerely,
Mike.
*
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