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RE: st: construct a loop


From   Nick Cox <n.j.cox@durham.ac.uk>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   RE: st: construct a loop
Date   Mon, 21 Feb 2011 18:12:34 +0000

This too is covered in the FAQ just cited. 

"It extends easily to the apparently much more difficult problem of going through all the distinct combinations of two or more variables, which is, in fact, only a little more difficult. 
    . egen group = group(varlist)

Now the code is exactly the same as before. That is, instead of one varname, you just need to spell out a varlist in the argument to egen."

Nick 
n.j.cox@durham.ac.uk 

Nikolaos Pandis


Thank you. I came up with the following code:

*********************
egen group=group(age_cat)

sum group  ,meanonly

foreach i of num 1/`r(max)' {
 stmh hivstatus if group ==`i'
}
****************

How could I make this to do the same thing for other variables such as age_cat?


--- On Sun, 2/20/11, Nick Cox <njcoxstata@gmail.com> wrote:

> Well, your solution then gets more
> complicated. The thread has already
> shown that you can nest loops. Also see
> 
> FAQ     . . . . . . . . . . Making
> foreach go through all values of a variable
>         . . . . . . . . . . . . . . . .
> . . . . . . . . . . . . . .  N. J. Cox
>         8/05    Is there a
> way to tell Stata to try all values of a
>                
> particular variable in a foreach statement without
>                
> specifying them?
>                 http://www.stata.com/support/faqs/data/foreach.html
> 
 
> On Sat, Feb 19, 2011 at 8:48 PM, Nikolaos Pandis <npandis@yahoo.com>
> wrote:
> 
> > Thank you all this looks great!
> >
> > Now what if I would like to run the same commands for
> more than just the varX variable?
> > What if the variables have variable number of category
> levels?
> >
> > Many thanks,
> >
> > Nick
> >
> >
> >
> > --- On Sat, 2/19/11, Nick Cox <njcoxstata@gmail.com>
> wrote:
> >
> >> From: Nick Cox <njcoxstata@gmail.com>
> >> Subject: Re: st: construct a loop
> >> To: statalist@hsphsun2.harvard.edu
> >> Date: Saturday, February 19, 2011, 9:14 PM
> >> Here is another way to do it.
> >>
> >> foreach p in "1 0" "2 0" "3 0" "2 1" "3 1" "3 2"
> {
> >> tokenize "`p'"
> >> stmh varX, c(`1' , `2')
> >> }
> >>
> >> Nick
> >>
> >> On Sat, Feb 19, 2011 at 12:03 PM, Nikolaos Pandis
> <npandis@yahoo.com>
> >> wrote:
> >>
> >> > I would like to run the following commands
> using the 4
> >> level varX:
> >> > stmh varX,c(1,0)
> >> > stmh varX,c(2,0)
> >> > stmh varX,c(3,0)
> >> > stmh varX,c(2,1)
> >> > stmh varX,c(3,1)
> >> > stmh varx,c(3,2)
> >> >
> >> > I would grateful if someone would help me
> construct a
> >> loop to run all the above commands.

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