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Re: st: RE: loop in stata


From   fernando andrade <fandrade.stat@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: loop in stata
Date   Thu, 11 Aug 2011 15:27:37 -0400

thank you Nick!!!

On Thu, Aug 11, 2011 at 3:18 PM, Nick Cox <n.j.cox@durham.ac.uk> wrote:
> Various ways to do it, none of them exactly beautiful:
>
> tokenize "a b c m"
> local j = 1
>
> foreach v in z y x n {
>        tab `v' ``j''
>        local ++j
> }
>
> Or more symmetrically:
>
> local J : word count "a b c m"
>
> forval j = 1/`J' {
>        local x : word `j' of "a b c m"
>        local y : word `j' of "z y x n"
>        tab `x' `y'
> }
>
> See also
>
> SJ-3-2  pr0009  . . . . . . . . . . . . . Speaking Stata:  Problems with lists
>        . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  N. J. Cox
>        Q2/03   SJ 3(2):185--202                                 (no commands)
>        discusses ways of working through lists held in macros
>
> or (directly)
>
> http://www.stata-journal.com/sjpdf.html?articlenum=pr0009
>
> for a much longer discussion.
>
> Nick
> n.j.cox@durham.ac.uk
>
> fernando andrade
>
> I am trying to make a simple loop in stata but i cannot figure out how to.
> i have two sets of variables let's say:
> set1: a b c ...m
> set2: z y x...n
>
> i want to make a loop to run the tabs
> tab a z
> tab b y
> tab c x
> .
> .
> .
> tab m n
>
> i tried
> foreach X in a b c... m{
> foreach Y in z y x... n{
> tab `X' `Y',m
> }
> }
>
> the loop gave me all the posible combinatios between the two sets of
> variables. Is there a way to make a loop that tabs only a with z, b
> with y and so on
>
> *
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> *   http://www.ats.ucla.edu/stat/stata/
>

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