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Re: AW: st: local containing (all) variables' names in a dataset


From   Ulrich Kohler <kohler@wzb.eu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: AW: st: local containing (all) variables' names in a dataset
Date   Tue, 18 Aug 2009 18:32:45 +0200

-unab- does the trick as well and is documented:

. unab a: _all
. local b  make rep78
. local c:list  a - b
. disp "`c'"


Am Dienstag, den 18.08.2009, 09:39 -0500 schrieb Eric A. Booth:
> Thanks for the clarification, Nick.  I made the erroneous assumption  
> that an increase in the number after -ds- (e.g., ds2, ds3, ds5...)  
> meant newer versions of the program.
> 
>    Since -ds- is now an undocumented/unofficial command,  I am curious  
> whether there are other commands that have its functionality.  In the  
> "previously documented" link in the -ds- help file it says:
> 
> " Previously documented commands are commands of Stata from a previous  
> release that are no longer documented because they have been  
> superseded by more recent, better commands. "
> 
> I see that you can grab a c(varlist) from commands like -desc- and you  
> could probably use extended macro functions to piece together what - 
> ds- does, but is there another command that has -ds- 's functionality  
> built in & supersedes -ds- ??
> 
> Thanks,
> 
> Eric
> 
> __
> Eric A. Booth
> Public Policy Research Institute
> Texas A&M University
> ebooth@ppri.tamu.edu
> Office: +979.845.6754
> 
> 
> 
> On Aug 17, 2009, at 3:15 PM, Nick Cox wrote:
> 
> > Thanks to Eric and to other friends of -ds- for various plugs.
> >
> > There is some risk here of various small confusions. Let me clarify.
> >
> > 1. The official version of -ds- is the latest version there is. It
> > incorporates all my contributions that have lasting value, in my view
> > that is.
> >
> > 2. Otherwise this is the story:
> >
> > ds5 on SSC is for Stata 5.
> >
> > ds2 on SSC and in STB-56 is for Stata 6.
> >
> > ds2 in STB-60 is for Stata 7.
> >
> > ds3 on SSC is for Stata 7.
> >
> > So, unless you are using an ancient Stata, the previous versions are  
> > of
> > no current interest. They aren't even of historic interest! The key
> > point is that both the STB and SSC are archives, and thus inevitably
> > contain some superseded and obsolete stuff.
> >
> > Nick
> > n.j.cox@durham.ac.uk
> >
> > Eric A. Booth
> >
> > It's been updated to newer versions  by Nick Cox--see  -ds3- and -ds5-
> >
> > ssc install ds3
> > ssc install ds5
> >
> > On Aug 17, 2009, at 1:06 PM, David Jacobs wrote:
> >
> >> But -ds- still can be found after -help-
> >
> > Martin Weiss
> >
> >>> " a real hidden gem"
> >>>
> >>>
> >>>
> >>> Now demoted to "previously documented" status in Stata 11, though.
> >>> Grrr....
> >
> > Augusto Cadenas
> >
> >>> thank you very much for these quick answers. -ds- seems to
> >>> do a very fine job, a real hidden gem, as Martin wrote. (and yes,  
> >>> I'm
> >>> aware that I'm replacing the original dataset.)
> >
> >>> On Mon, Aug 17, 2009 at 3:49 PM, Martin Weiss<martin.weiss1@gmx.de>
> >>> wrote:
> >
> >>>> On -ds- also see
> > http://www.stata-journal.com/article.html?article=dm0040
> >
> > Scott Merryman
> >
> >>>> You can use macro list.  See -help macrolists-
> >>>>
> >>>> For example:
> >>>>
> >>>> . sysuse auto ,clear
> >>>> (1978 Automobile Data)
> >>>>
> >>>> . ds
> >>>> make          mpg           headroom      weight        turn
> >>>> gear_ratio
> >>>> price         rep78         trunk         length
> >>> displacement
> >>>> foreign
> >>>>
> >>>> . local a = r(varlist)
> >>>>
> >>>> . local b  make rep78
> >>>>
> >>>> . local c:list  a - b
> >>>>
> >>>> . disp "`c'"
> >>>> price mpg headroom trunk weight length turn displacement
> >>> gear_ratio foreign
> >
> > On Mon, Aug 17, 2009 at 8:38 AM, Augusto Cadenas
> >
> >>>>> I have to collapse a series of datasets and I would appreciate
> >>> your
> >>>>> help. The issue is that these datasets have different variables,
> >>> but
> >>>>> always the same variable by which I want to collapse. So I have
> >>> to run
> >>>>> the following command:
> >>>>>
> >>>>> collapse (mean) id (sum) [all other variables here], by(name)
> >>>>>
> >>>>> And I would like to embed this in a foreach loop of the type
> >>>>>
> >>>>> local datasets `"dataset1 dataset2 dataset3"'
> >>>>> foreach X of local datasets {
> >>>>>    use `X', clear
> >>>>>    collapse (mean) id (sum) [all other variables here], by(name)
> >>>>>    save, replace
> >>>>> }
> >>>>>
> >>>>> The issue for me is how to create a local that contains the
> >>> names of
> >>>>> all variables in each dataset, except for "name" and "id". Any
> >>>>> suggestions are appreciated!
> >
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