Re: st: RE: Creating loops to drop observations each time regression is run

[Samia Tavares <samia.tavares@rit.edu>]

That worked. Thanks a lot!!

Samia


On Apr 1, 2006, at 7:52 PM, Neil Shephard wrote:

> On 4/2/06, Thuy Le <tl6775a@american.edu> wrote:
> > You can use the 'foreach'. See help on 'foreach' for details.
> Although in this example forval may be more appropriate...
>
> > > use dataset.dta, clear
> > > drop if code=="country1"
> > > regress y x
> > >
> > > use dataset.dta, clear
> > > drop if code=="country2"
> > > regress y x
> Assuming that code is always countryN then you could...
>
> forval x = 1/N{
>    use dataset, clear
>    drop if(code == "country`x'")
>    regress y x
> }
>
> You would substitute N in the above for the maximum country number.
>
> If however you actually have named countries such as "Australia",
> "United States", "Germany", "Nepal", "United Kingdom", "France" etc.
> then you would have to use foreach....
>
> foreach x in Australia "United States" France Germany "United  
> Kingdom" Nepal{
>    use dataset, clear
>    drop if(code == "`x'")
>    regress y x
> }
>
> Note that countries where there are two parts to the name need to be
> encapsulated in double quotes.
>
> Nick Cox has written a "Speaking Stata" article on this very topic...
>
> Cox, NJ (2002) Speaking Stata: How to face lists with fortitude. Stata
> Journal 2:202-222
>
> http://ideas.repec.org/a/tsj/stataj/v2y2002i2p202-222.html
>
> Alternatively you may be interested in Roger Newson's -parmby- command
> (part of the parmest package).  See -ssc desc parmest- for more
> information and -ssc install parmest- to install.
>
> Neil
> --
> "The best safety device in climbing is always situated between your
> ears" - Ross Weiter, Perth Rock Climbing Guide (2002)
>
> Email - nshephard@gmail.com / neilshep@cyllene.uwa.edu.au
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