Frederik, the error you observed confuses me because
-oaxaca- should not apply -svymean- at all if used with
standard regression models.
Is it possible that the your data are -svyset-? Does the
problem persist if you type the following commands?
. reg driver revenue profit haul ltl spec ltlspec union ///
unltl unspec if regulate==0
. est store regulated
. reg driver revenue profit haul ltl spec ltlspec union ///
unltl unspec if regulate==1
. est store deregulated
. svyset, clear
. oaxaca regulated deregulated
ben
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of
> Frederick Guy
> Sent: Friday, June 03, 2005 2:55 PM
> To: [email protected]
> Subject: st: svymean error in oaxaca
>
>
> Attempting to use the oaxaca command (*not* decomp), I get an error
> message which appears to be due to a problem with the
> command's use of
> svymean. I note elsewhere on this list that use of "if" terms with
> svymean can lead to errors, but I don't see what alternative
> I have with
> the oaxaca command.
>
> Relevant bits of the log follow:
>
> .
> . reg driver/*
> > */ revenue profit haul ltl spec ltlspec union
> unltl unspec /*
> > */ if regulate==0
>
> Source | SS df MS Number of obs
> = 770
> -------------+------------------------------ F( 9,
> 760) =
> 38.09
>
> [...]
>
> . est store regulated
> .
> . reg driver/*
> > */ revenue profit haul ltl spec ltlspec union
> unltl unspec /*
> > */ if regulate==1
>
> Source | SS df MS Number of obs
> = 898
> -------------+------------------------------ F( 9,
> 888) =
> 24.80
> [...]
>
> . est store deregulated
>
> . oaxaca regulated deregulated
> (note: using svymean to compute vce of means of regressors)
> subpop() does not contain a valid varname
> r(198);
>
> end of do-file
> r(198);
>
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