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Re: st: Re: Temporary variables saved by accident

From   "Roger B. Newson" <>
Subject   Re: st: Re: Temporary variables saved by accident
Date   Wed, 09 Jan 2013 16:03:40 +0000

Yes, the temporary variables ARE dropped from the dataset in memory when the do-file stops executing. HOWEVER, they are not dropped from already-saved dataset files. This is not really surprising (I think), as it is probably not reasonable to expect Stata to modify and replace all disk-file datasets created over the execution of a do-file, as part of the termination sequence of the do-file.

You might like to do the saving between a -preserve- and a -restore-, or even to use the SSC package -subsave-, which saves subsets of variables.

I hope this helps.

Best wishes


Roger B Newson BSc MSc DPhil
Lecturer in Medical Statistics
Respiratory Epidemiology and Public Health Group
National Heart and Lung Institute
Imperial College London
Royal Brompton Campus
Room 33, Emmanuel Kaye Building
1B Manresa Road
London SW3 6LR
Tel: +44 (0)20 7352 8121 ext 3381
Fax: +44 (0)20 7351 8322
Web page:
Departmental Web page:

Opinions expressed are those of the author, not of the institution.

On 09/01/2013 15:52, Adrian Sayers wrote:
Hi Billy,

Honestly i would have thought temporary variables would be have more
like local macros.

Also the help file says they are dropped when the program or do file
concludes .

So if i save the file, clear the data set, why are they all not dropped,
so when i re-open the file they should not be there. After all my do
file did conclude.

It just seems strange behaviour for temporary variables to be made



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