Re: st: Need help programming for dates in Stata

[Jeph Herrin <stata@spandrel.net>]

thx

On 3/5/2013 2:42 PM, Nick Cox 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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