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Re: st: Collapse with sum function and missing values


From   Michael Mitchell <Michael.Norman.Mitchell@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Collapse with sum function and missing values
Date   Wed, 10 Feb 2010 14:38:56 -0800

Oh, I like that a lot. That is much cleaner than the clunky things I
was thinking.

Thank you Nick!

On 2/10/10, Nick Cox <n.j.cox@durham.ac.uk> wrote:
> Something like this?
>
> local i = 1
> foreach v of varlist <whatever> {
> 	local call `call' (sum) `v' (count) nonmiss`i' = `v'
> 	local ++i
> }
>
> collapse `call', by(group)
>
> local i = 1
> quietly foreach v of varlist <whatever> {
> 	replace `v' = . if nonmiss`i' == 0
> 	local ++i
> }
> 	
> Nick
> n.j.cox@durham.ac.uk
>
> Michael Mitchell
>
> Thanks all, both for the general thoughts on the underlying rationale
> for this, as well as the practical suggestions. As some noted, I could
> do this...
>
> . collapse (sum) x (count) nonmiss=x, by(group)
> . replace x=. if nonmiss==0
>
> I have about 100 "x" values, and there is no pattern to the names. All
> methods I can think of for ensuring that the "x" values are . when all
> members of the group are . involve either substantial typing or a fair
> amount of programming. Am I overlooking a simple solution for this?
>
>
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