st: RE: RE: combine data by groups

["Martin Weiss" <martin.weiss1@gmx.de>]

<>

"-collapse- to maxima."



In this _particular_ constellation, the minimum will serve Guang just as
well:


*******
clear*

inp str10 personid  byte(parentsid  momlive dadlive)
001     1      0  .
001     2      .   1
002     1      1  .
002     2        .   1
end

compress
list, noo

collapse (min) momlive dadlive, by(personid)
list, noo
*******


HTH
Martin


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox
Sent: Mittwoch, 3. März 2010 21:06
To: statalist@hsphsun2.harvard.edu
Subject: st: RE: combine data by groups

-collapse- to maxima. 

Advice: Don't flag questions as "easy". 

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

G. Dai

hi all, this is an easy question,but somehow I can't figure it.
The data is like:
personid     parentsid              momlive                   dadlive
001                   1                      0
 .
001                   2                      .
  1
002                   1                      1
 .
002                   2                        .
   1

where personid and parentsid  are person and her parents' id.
when parentid==1, we only record whether mom still live or not (momliv)
similarly
for parentid==2 and dadlive.

I want to change the data set to the following form

personid         momlive                   dadlive
001                  0                              1
002                   1                              1

what is the best way to do this?

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