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Re: st: SV: How to restore dataset after preserve, but keep some specific variables?


From   Stata Chris <statachris@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: SV: How to restore dataset after preserve, but keep some specific variables?
Date   Thu, 25 Jun 2009 11:09:28 -0400

Thanks Neil and Kim,
the saving and merging does the job.
Have a good afternoon ;-),
Chris


2009/6/25 Kim Lyngby Mikkelsen (KLM) <klm@arbejdsmiljoforskning.dk>:
> Hallo Christoph
>
> At the end of each rounds, save the new variables together with a unique identification variable, and then restore.
>
> After restore, you can merge in the saved variables.
>
> Rerards
> Kim
>
> Kim Lyngby Mikkelsen
> Seniorforsker
> Arbejdsulykker og Sikkerhed
> Det Nationale Forskningscenter for Arbejdsmiljų
>
> -----Oprindelig meddelelse-----
> Fra: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] På vegne af Stata Chris
> Sendt: 25. juni 2009 16:00
> Til: statalist@hsphsun2.harvard.edu
> Emne: st: How to restore dataset after preserve, but keep some specific variables?
>
> Good morning,
>
> I need to do similar calculations, generating a new variable, on
> different subsamples of my dataset,
> and was therefore planning to use the preserve command each time
> before cutting the dataset,
> and then, after having generated the respective variable, restore to
> return to the full dataset.
>
> The problem with this is that once I restore the data, my new variable
> is gone as well.
> I first thought I could store this in a local macro,
> but when I wanted to summarize all macros at the end of the dofile, it
> turned out Stata wanted to use the lost variable, having apparently
> remembered only that the macro consisted of said variable, but not the
> distribution of the variable itself.
>
> So my question is: How can I after each of these rounds generally
> return to the full dataset,
> but keep the one new variable?
>
> Many thanks and best regards,
> Christoph
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