Re: st: keep

[Erik Bihagen <erik.bihagen@sofi.su.se>]

Thanks Sebastian, it works!

Erik

Sebastian F. B�chte wrote:
> 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. B�chte 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
> > > >
> > > >
> > > > *
> > > > *   For searches and help try:
> > > > *   http://www.stata.com/support/faqs/res/findit.html
> > > > *   http://www.stata.com/support/statalist/faq
> > > > *   http://www.ats.ucla.edu/stat/stata/
> > > >
> > > >
> > > >         
> > > *
> > > *   For searches and help try:
> > > *   http://www.stata.com/support/faqs/res/findit.html
> > > *   http://www.stata.com/support/statalist/faq
> > > *   http://www.ats.ucla.edu/stat/stata/
> > >
> > >
> > >       

*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/