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


From   Beatriz Rodriguez Prado <bprado@eco.uva.es>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: looping twice over same variables without repeating results
Date   Fri, 18 May 2012 12:31:56 +0200

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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