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Re: st: RE: summarize by different levels/groups with -egen- ?


From   Rebecca Pope <rebecca.a.pope@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: summarize by different levels/groups with -egen- ?
Date   Fri, 11 Jan 2013 11:58:55 -0600

Joerg's approach is a good one.

My one suggestion would be that if you don't want to drop the
observations on children who don't have distinct combinations of Class
& Pathogen, instead of -keep-:

tab pat2 if tag

Rebecca

On Fri, Jan 11, 2013 at 11:25 AM, Joerg Luedicke
<joerg.luedicke@gmail.com> wrote:
> Consider the following:
>
> // Data
> clear
>
> input str2 Class str1 Pathogen
> A1 H
> A1 S
> A1 T
> A2 S
> A2 K
> A3 H
> A3 D
> B1 H
> B1 S
> end
>
> // Flagging classes with at least one H
> bys Class: egen pat2=max(Pathogen=="H")
>
> // To analyze that at class level
> bys Class: gen tag=_n==1
> keep if tag
>
> Joerg
>
<snip>
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