Re: st: looping twice over same variables without repeating results

[Beatriz Rodriguez Prado <bprado@eco.uva.es>]

Thank you Nick.
The other question you raise is my problem. Sorry it was not clear.
I do not want to regress y on x and x on y. I just want one of two 
regressions.

Beatriz


El 18/05/2012 12:03, Nick Cox escribió:
> Your question raises another which is whether you want the regression
> of y on x _and_ the regression of x on y.
>
> foreach x of local varlist {
>          foreach y of local varlist {
>                   if "`x'" != "`y'" regress `y' `x'
>          }
> }
>
> is a safer and better way to avoid -regress-ing a variable on itself
> but it will produce all the other p (p - 1) regressions for p
> variables.
>
> Nick
>
> On Fri, May 18, 2012 at 10:52 AM, Beatriz Rodriguez Prado
> <bprado@eco.uva.es>  wrote:
>
> > I have 3 variables named pmm_and pmm_ext pmm_es and I want to make simple
> > regressions of each pair of variables.
> > I have writen this code
> >
> > foreach x in and ext es {
> >     foreach y in and ext es{
> >         if pmm_`x'!=pmm_`y' {
> >         regres pmm_`x' pmm_`y'
> >         }
> >     }
> > }
> >
> > How could avoid to run repeated regressions?
> > In fact I have 50 variables and have to run regressions, test some
> > hyphotesis and make graphs and the output of the loop is unnecesary big.
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