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Re: st: keep


From   "Sebastian F. Büchte" <sfbuechte@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: keep
Date   Mon, 10 Sep 2007 13:58:02 +0200

Erik

in deed I guess you are right. So my suggestions would now involve a
little programming:

*----- example start
//local keeplist holds the list of variables which you would like to
keep if they
//exist in the dataset
local keeplist v1 v2 v3

local kl_modif
foreach el of local keeplist {
	capture confirm variable `el'
	if _rc==0 {
		local kl_modif `kl_modif' `el'
	}
}
capture keep `kl_modif'

*-----example end

2007/9/10, Erik Bihagen <erik.bihagen@sofi.su.se>:
> Thanks,
>
> but i tried that. The problem is that the result of -capture keep v1 v2
> v3 -  is that the command is disregarded. As an example; I want to keep
> v1, and v2, but not v4 for data sets where v1, v2 and v4 are present
> (and run the same command for all other data sets I have, see below)
>
> /Erik
>
> Sebastian F. Büchte wrote:
> > Erik
> >
> > try -capture keep v1 v2 v3-.
> >
> > regards
> > Sebastian
> >
> > 2007/9/10, Erik Bihagen <erik.bihagen@sofi.su.se>:
> >
> >> Hi Statalisters,
> >>
> >> Is there a way to let the keep command do the following?
> >> I want to keep, let's say, three variables v1 v2 v3 before saving data,
> >> but all these three variables do not exist in all data sets for which I
> >> want to run the command (I want to do this with a loop using many data
> >> sets and I use global to define the variables).
> >>
> >> I could drop variables instead using "capture drop v4" etc, but that
> >> would become a very long do file.
> >>
> >> Cheers
> >>
> >> Erik
> >>
> >> --
> >> Erik Bihagen
> >> Swedish Institute for Social Research
> >> Stockholm University
> >> SE-106 91 Stockholm
> >> Phone: +46 8 16 26 51
> >> Fax: +46 8 15 46 70
> >>
> >>
> >> *
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