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Re: st: A new dataset with means by period


From   Geomina Turlea <geomina@yahoo.fr>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: A new dataset with means by period
Date   Fri, 12 Apr 2013 13:03:01 +0100 (BST)

Hi Miguel,
you can do the same thing that you tried by using collapse

by date: collapse (mean) var


_________________________________________Geomina Turlea
TODO AQUEL QUE SUEÑA SE CONVIERTE EN ARTISTA


--- On Fri, 4/12/13, Miguel Angel Duran <maduran@uma.es> wrote:

> From: Miguel Angel Duran <maduran@uma.es>
> Subject: st: A new dataset with means by period
> To: statalist@hsphsun2.harvard.edu
> Date: Friday, April 12, 2013, 2:53 PM
> From a panel data set, I want to
> generate a new dataset with the means per
> period. I have tried to use 'By date: compress (mean) var',
> but by: does not
> seem to work with compress. Will you please help me? Is
> there a way to do
> this automatically?
> 
> M. Angel.
> 
> -----Mensaje original-----
> De: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu]
> En nombre de Miguel Angel
> Duran
> Enviado el: lunes, 08 de abril de 2013 21:27
> Para: statalist@hsphsun2.harvard.edu
> Asunto: st: Dropping all subjects but those in the last
> period
> 
> My dataset includes observations for about 9000 companies
> per year in a
> twenty years period. To clean the dataset, I would like to
> drop all those
> companies that are not present in the last year (because the
> rest went
> bankrupt or were absorbed), but I do not know how to do it.
> Can this be done
> just by splitting the datasets by period and then merging
> them?  Each
> company has the same id across years. Thanks.
> 
> Miguel A. Duran.
> 
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