Re: st: RE: collapse panel data for each year

[Thomas Trikalinos (.Mac) <ttrikalin@mac.com>]

Would this be better?

. egen tralala = group(country, year)
. collapse x y , by(tralala)


On May 28, 2004, at 19:14, sarah smith wrote:

> Hi Nick,
> If I use collapse as below:
>
> collapse x y, by(country)
>
> It is not useful for me since I need to run collapse for the data 
> portions in each of the 20 years.
> Best,
> Sarah
>
>
>
>
> > From: "Nick Cox" <n.j.cox@durham.ac.uk>
> > Reply-To: statalist@hsphsun2.harvard.edu
> > To: <statalist@hsphsun2.harvard.edu>
> > Subject: st: RE: collapse panel data for each year
> > Date: Fri, 28 May 2004 16:53:46 +0100
> >
> > Once you've -collapse-d the data once, you
> > have a new dataset, so I can't see that
> > you'd want to do this in a loop.
> >
> > At first glance you just need to include
> > the variable for country in the -by()- option.
> >
> > Nick
> > n.j.cox@durham.ac.uk
> >
> > sarah smith
> > >
> > > I have panel data for several industries in 40 countries for
> > > 20 years. For
> > > each year, I am trying to collapse the data by country. I
> > > tried to use
> > > foreach and forvalues commands, but could not work it out. I would
> > > appreciate if you can help me.
> >
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