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RE: st: RE: Variogram for longitudinal data


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: RE: Variogram for longitudinal data
Date   Tue, 27 Oct 2009 15:27:51 -0000

I guess that they haven't written it for precisely the reasons you
haven't written it. Most people prefer that someone else does it. (Me
too; I really wouldn't have the time, inclination or ability to write my
own text editor, mailer or Mata compiler.) 

After all, why there isn't there a Stata program for anything else you
want to name that hasn't been tackled already? 

Nick 
n.j.cox@durham.ac.uk 

Raphael Fraser

I am very surprize that nobody as wrote a variogram program for
longitudinal data since its such an important part of analyzing
longitudinal data. Perhaps individuals just wrote their own programs
which they have not 'shared." I think I will try to clone variog2.

Thanks to Nick and Stas for responding.

On Tue, Oct 27, 2009 at 8:57 AM, Nick Cox <n.j.cox@durham.ac.uk> wrote:

> The programs -variog- and -variog2- are in the -variog- package on
SSC.
> Please remember to specify where user-written stuff you refer to comes
> from, as long requested on this list.
>
> I believe the short answer to this to be No.
>
> I also think that the statement is a little misleading. Say rather
that
> -variog2- (the more relevant here) pays no attention to the special
> structure of longitudinal data but unless otherwise instructed lumps
all
> panels together. (You could use -variog2- with panel data by
specifying
> one of the coordinates as time and the other as a constant variable
> constructed as a pacifier.)
>
> I think you have at least five possibilities:
>
> 1. There may be such a package, but neither of us knows about it.
>
> 2. You can apply -variog2- to each panel separately, if that is the
> implication, and pool the answers.
>
> 3. You can clone -variog2- and change the code so that it supports
panel
> structure. The code is neither long nor especially complicated.
>
> 4. You can wait for the program author (me) to generalise the program,
> which is on my to do list, although I doubt I will get to it for a few
> months yet.
>
> 5. Apply -variog2- regardless as above.
>
> Nick
> n.j.cox@durham.ac.uk
>
> Raphael Fraser
>
> Are there any programs available to estimate variogram for
> longitudinal data? Note that -variog- or -variog2- does not apply to
> longitudinal data.

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