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Re: st: RE: Re: distance data missing values


From   Ermal Hitaj <ermalhitaj@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: Re: distance data missing values
Date   Fri, 17 Oct 2008 07:39:11 -0700 (PDT)

Nick, thanks a lot,

What you suggested worked perfectly.
Also thanks everybody for taking the time to answer.

E.


--- On Fri, 10/17/08, Nick Cox <n.j.cox@durham.ac.uk> wrote:

> From: Nick Cox <n.j.cox@durham.ac.uk>
> Subject: st: RE: Re: distance data missing values
> To: statalist@hsphsun2.harvard.edu
> Date: Friday, October 17, 2008, 7:29 AM
> In that spirit: 
> 
> I take that the only issue is filling in gaps for pairs of
> trading
> partners, i.e. the distance between A and B is necessarily
> the same as
> the distance between A and B. 
> 
> Then I don't see any need for a file fandango: 
> 
> gen first = cond(Exporter < Importer, Exporter,
> Importer) 
> gen second = cond(Exporter < Importer, Importer,
> Exporter) 
> egen pairs = group(first second) 
> bysort pairs (distance) : replace distance = distance[1] if
> missing(distance) 
> 
> Nick 
> n.j.cox@durham.ac.uk 
> 
> Martin Weiss
> 
> This question is quite close to: 
> http://www.stata.com/statalist/archive/2008-10/msg00578.html
> Might want to try your luck there...
> 
> Ermal Hitaj
> 
> > I have trade distance data in a long form. I have
> missing values as 
> > follows.
> >
> > Exporter Importer Distance
> > A          B       1000km
> > B          A          .
> >
> > I need to substitute the missing values with the
> distance value from
> the 
> > case where country A is the exporter and B is the
> importer.
> > Obviosly, there's a lot of countries (and a lot of
> products).
> 
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