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st: RE: loop in stata


From   Nick Cox <n.j.cox@durham.ac.uk>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   st: RE: loop in stata
Date   Thu, 11 Aug 2011 20:18:21 +0100

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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