Sorry, Geomina, I meant collapse (not compress), but collapse does not work
with by:.
-----Mensaje original-----
De: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] En nombre de Geomina Turlea
Enviado el: viernes, 12 de abril de 2013 14:03
Para: statalist@hsphsun2.harvard.edu
Asunto: Re: st: A new dataset with means by period
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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