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Re: st: St: loop within a loop


From   Nick Cox <njcoxstata@gmail.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: St: loop within a loop
Date   Tue, 30 Apr 2013 16:25:48 +0100

First off, let's note that each pair of -generate- and -replace- can
be collapsed to one.

gen white = eth==1
generate black= eth==2
generate hispanic= eth==3
generate asian= eth==4
generate mixed= eth==5

Now it's easier to see structure. You don't really need a loop, as you
could do that in two lines with -tabulate, gen()- and -rename-.

But to answer your question in terms of loops. Here's one way, and
there are others.

tokenize "white black hispanic asian mixed"

forval i = 1/5 {
     gen ``i'' = eth == `i'
}

See also broader discussions within

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

SJ-2-2  pr0005  . . . . . .  Speaking Stata:  How to face lists with fortitude
        . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  N. J. Cox
        Q2/02   SJ 2(2):202--222                                 (no commands)
        demonstrates the usefulness of for, foreach, forvalues, and
        local macros for interactive (non programming) tasks

which are both freely available as .pdfs.

Nick
njcoxstata@gmail.com


On 30 April 2013 16:17, Adam Guerrero <adamgue@gmail.com> wrote:
> Hello,
>
> I am trying to create a loop within a loop for the following block of
> code (loop through variables white, black, hispanic, asian, and mixed
> from values 1 to 5):
>
> replace white=1 if eth==1
> generate black=0
> replace black=1 if eth==2
> generate hispanic=0
> replace hispanic=1 if eth==3
> generate asian=0
> replace asian=1 if eth==4
> generate mixed=0
> replace mixed=1 if eth==5
>
> I know decode would be easier, but please consider responding to help
> me out learning how to loop.
>
> I'm relatively new to Stata, so any suggestions would be very much appreciated.
>
> Thank you in advance,
>
> Adam Guerrero
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