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The most obvious explanation is that you do have that __000003
variable present in your data set, for some strange reason (the data
set was saved while -tempvar- was created, but before it was cleaned
with an exit from a program). Sometimes, I do get something like that
with a complicated set of nested routines and some complicated
patterns of who creates and who cleans the -tempvar-s, although I
would expect that Stata would try to come up with the next available
-tempvar- name upon having checked that a variable already exists in
the data set. The conflict like that may also arise if you
deliberately drop a tempvar rather than let Stata do it. But it would
be strange if this error were in the official code.

On Tue, Jul 31, 2012 at 4:59 PM,  <S.Jenkins@lse.ac.uk> wrote:
> I am unable to run some -svy- related commands using one of my data
> sets. The puzzle is that I have no problems with similar commands
> applied to data from the Ref Manuals (cf. example below: uses
> "stage5a.dta").
>
> The issue: after -svyset-,  -svy: ...- commands produce a r(110) error
>
> [P]     error . . . . . . . . . . . . . . . . . . . . . . . .  Return
> code 110
>         __________ already defined;
>         A variable or a value label has already been defined, and you
>         attempted to redefine it.  This occurs most often with
generate.
>
> But I had made no such attempt to redefine, as far as I know. With
-set
> trace on-, it seems that the command applied to my data is choking
when
> it makes a call to -marksample-. There's an example below: uses
> "voldat.dta".
>
> In another example (not shown), I had been using -idonepsu- (command
to
> deal with singleton PSUs; on SSC), and also hit the same error, though
> this time with a call to -mark- according to a -set trace on-.  [Even
> more strangely (to me), I have a log file from a job also using
> -idonepsu and same data set, dated 6 Jul 2012, that ran without
error.]
>
> Any ideas?
>
> Stata 12MP/4, fully updated. Behaviour observed on Win7/64bit and Win
> XP/32bit
> . display "`c(tmpdir)'"
> C:\DOCUME~1\stephen\LOCALS~1\Temp/


<snip>


Stephen
-------------------------------------
Professor Stephen P. Jenkins <s.jenkins@lse.ac.uk>
Department of Social Policy 
London School of Economics and Political Science
Houghton Street, London WC2A 2AE, U.K.
Tel: +44 (0)20 7955 6527
Changing Fortunes: Income Mobility and Poverty Dynamics in Britain, OUP
2011, http://ukcatalogue.oup.com/product/9780199226436.do
Survival Analysis using Stata:
http://www.iser.essex.ac.uk/survival-analysis  
Downloadable papers and software: http://ideas.repec.org/e/pje7.html 

Please access the attached hyperlink for an important electronic communications disclaimer: http://lse.ac.uk/emailDisclaimer

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