Thanks, Roger, Scott, Maarten, and Jean-Benoit! Your answers are really
helpful.
Jian Zhang
On Tue, 7 Feb 2006, Newson, Roger B wrote:
> You need to insert
>
> drop `temxxx'
>
> before your -save- statement. Temporary variables defined in a do-file
> survive until the end of execution of the do-file unless explicitly
> dropped.
>
> Hope this helps.
>
> Roger
>
>
> Roger Newson
> Lecturer in Medical Statistics
> POSTAL ADDRESS:
> Respiratory Epidemiology and Public Health Group
> National Heart and Lung Institute at Imperial College London
> St Mary's Campus
> Norfolk Place
> London W2 1PG
> STREET ADDRESS:
> Respiratory Epidemiology and Public Health Group
> National Heart and Lung Institute at Imperial College London
> 47 Praed Street
> Paddington
> London W1 1NR
> TELEPHONE: (+44) 020 7594 0939
> FAX: (+44) 020 7594 0942
> EMAIL: [email protected]
> WEBSITE: http://www.kcl-phs.org.uk/rogernewson/
> Opinions expressed are those of the author, not of the institution.
>
>
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of Jian Zhang
> Sent: 06 February 2006 23:40
> To: [email protected]
> Subject: st: a question about tempvar
>
> Dear Stata Users,
>
> Have you run into the following problem when using command tempvar? I
> can
> not fix the problem. Hope that you can help me out.
>
> The problem is as follows. Sometimes I need to use some temporary
> variables. So I use command tempvar.
>
> For example, my do file is the following:
>
> use file.dta, clear
>
> sort eid
> tempvar temxxx
> by eid: gen `temxxx'=_n
> drop if `temxxx'!=1
>
> sort eid
>
> save file1.dta, replace
>
> The problem is that after I run the whole do file, which will save the
> data in file1.dta, next time I open file1.dta, I ALWAYS find that there
> is
> an additional variable, which is __000000, is added to my data. All of
> the values of this variable is 1. So I have to delete this variable and
> resave the whole data. I have run into this problem several times and
> could not find why and how to fix it. If this is going to be the way,
> it
> seems to me that it is much more convinent that I could just creat a new
> variable called temxxx and then drop it later on when I don't need it
> anymore.
>
> Is there a way that I can get around this? Thanks.
>
> Jian Zhang
>
>
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