Re: st: RE: Problem with generating time dummies in panel data

["Daghan Yeldan" <caracicatriz2002@hotmail.com>]

Thanks Ada,
But tab year if ~mi(minder), gen(minder)
makes my minder values 0 for all the id (resp96)numbers. I am wondering if I 
can generate these dummies for each with a command which captures the id 
number and the year as well. Dropping missing values wont help as well than 
I get no observation warning. I am quite new with Stata and I think what I 
am looking forward to create has to capture the id numbers and years both 
otherwise it is useless. Until now the advices I get generate things which 
are almost the same and were dropped when they put them in a regression.
Moreover, when I try to implement the advices of the user (I thank them for 
their attendance my problem) generates 0 for the other years although there 
is no observations are present. This is the problem I am trying to solve for 
days.

best wishes,
Daghan



> From: "Ada Ma" <heu034@googlemail.com>
> Reply-To: statalist@hsphsun2.harvard.edu
> To: statalist@hsphsun2.harvard.edu
> Subject: Re: st: RE: Problem with generating time dummies in panel data
> Date: Mon, 17 Jul 2006 14:42:39 +0100
>
> You have to tell Stata that you don't want a value generated if minder
> is missing.  Your command refers to the year variable, not the minder
> variable although the generated variables are named minder1, minder2,
> minder3, you could have called the three dummy variables holiday1,
> holiday2, holiday3, if you have written -tab year, gen(holiday)-
>
> Therefore if you want no dummies generated when minder is missing you
> should write:
>
> tab year if ~mi(minder), gen(minder)
>
> Or you can restrict your regression to use only obs that has a minder
> value.  Or you can drop all obs that has got a missing minder value.
>
>
> On 7/17/06, Daghan Yeldan <caracicatriz2002@hotmail.com> wrote:
> > Thank you at least I get the year dummies, but again I am facing with a
> > problem;
> > Namely, the variable minder is defined as hp<h and gets the value 1 if 
> > this
> > is the case, gets value 0 if this is not the case for each year. Now when 
> > I
> > list the variables I see value 0 is attached to a year even if there is no
> > minder value associated with the year. For example
> >        +-----------------------------------------------------------+
> >        |      resp96      y   minder   minder1   minder2   minder3 |
> >        |-----------------------------------------------------------|
> >     1. |         701   1994        0         1         0         0 |
> >     2. |         701   1996        1         0         1         0 |
> >     3. |        1602   1994        .         1         0         0 |
> >     4. |        1602   1996        .         0         1         0 |
> >     5. |        1602   1998        .         0         0         1 |
> >        |-----------------------------------------------------------|
> >
> > For resp96 1602, there is no minder variable present, but if you look at 
> > the
> > dummies there are values attached to them.
> > If I use them in a regression, then I get muticollinearity and 
> > automatically
> > dropped by stata.
> > My excuses for the inconvienient results but I am stucked with this 
> > problem
> > by days.
> >
> > Thank you in advance,
> > d
> >
> >
> >
> > >From: "Scott Merryman" <smerryman@kc.rr.com>
> > >Reply-To: statalist@hsphsun2.harvard.edu
> > >To: <statalist@hsphsun2.harvard.edu>
> > >Subject: RE: st: RE: Problem with generating time dummies in panel data
> > >Date: Mon, 17 Jul 2006 08:19:45 -0500
> > >
> > >For year dummies I would try -tab year, gen(minder)-
> > >
> > >This will create three dummies callers (named minder1, minder2, minder3
> > >corresponding to years 1994, 1996, and 1998).
> > >
> > >Scott
> > >
> > >
> > > > -----Original Message-----
> > > > From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-
> > > > statalist@hsphsun2.harvard.edu] On Behalf Of Daghan Yeldan
> > > > Sent: Monday, July 17, 2006 8:15 AM
> > > > To: statalist@hsphsun2.harvard.edu
> > > > Subject: RE: st: RE: Problem with generating time dummies in panel 
> > data
> > > >
> > > > thnx for the advice. But I tried them all before I sent this message.
> > >The
> > > > problem I get is when I do this,
> > > >
> > > > tab minder,g(min) it only creates two dummies instead of 3. I have 3
> > >years
> > > > of variables.
> > > > How can I solve this problem?
> > > > cheers,
> > > > d
> > >
> > >
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