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Re: st: Storing output from a loop in only one variable


From   Eric Booth <ebooth@ppri.tamu.edu>
To   "<statalist@hsphsun2.harvard.edu>" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Storing output from a loop in only one variable
Date   Thu, 8 Jul 2010 15:41:06 +0000

<>

I think you just want:

gen x = .
foreach a in `range' {
replace x = `a' if !mi(`a') & mi(`x')
}

Unless I am not understanding your description (if not, an example with some sample data would be useful)

Also, note that your loop:

scalar i=1
foreach a in {range} {
...
gen x={output} in i
i++ //or i=i+1
}

would not work because you are asking Stata to re-generate "x" each time it passes through the loop.

~ Eric

__
Eric A. Booth
Public Policy Research Institute
Texas A&M University
ebooth@ppri.tamu.edu
Office: +979.845.6754

On Jul 8, 2010, at 10:32 AM, Dani Tilley wrote:

> Hi,
> 
> I'm trying to store certain output in a new variable while I loop through 
> different categories. At the end I want to average what I've stored and perhaps 
> do some other manipulations. Right now, my code looks like this:
> 
> foreach a in {range} {
> ...
> gen x`a'={output} in 1
> ...
> }
> 
> su x*, mean
> di r(mean)
> drop x*
> 
> So I create `a' variables that have the desired output as their 1st observations 
> and N-1 missing points. I then average across these variables and drop them. 
> While this gets the job done, I feel it's very clumsy. I'm looking to create a 
> single variable, x, that will hold all `a' outputs. Something like
> 
> scalar i=1
> foreach a in {range} {
> ...
> gen x={output} in i
> i++ //or i=i+1
> }
> 
> Thanks,
> DF Tilley
> 
> 
> 
> 
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