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st: looping over observations -mata-?


From   Ricardo Ovaldia <ovaldia@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: looping over observations -mata-?
Date   Wed, 12 Oct 2005 08:49:34 -0700 (PDT)

Dear all,

I have household data with one observation per family
member. All House hold have one or both parents and
anywhere from 1 to seven children. All households have
children but no grandparents or other relatives. Here
are a few tipical observations and relevant variables:

. cl  familyid subjid relation

     familyid    subjid   relation
  1.     1001         1          f
  2.     1001         2          m
  3.     1001         3          c
  4.     1001         4          c
  5.     1002         1          m
  6.     1002         2          c
  7.     1002         3          c
  8.     1003         1          m
  9.     1003         2          f
 10.     1003         3          c

where for -relation-: f=father, m=mother and c=child

I want to create two new variables which hold, for the
children, their parent's -subjectid-  as follows:

     familyid    subjid   relation  fatherid  motherid
  1.     1001         1          f         .         .
  2.     1001         2          m         .         .
  3.     1001         3          c         1         2
  4.     1001         4          c         1         2
  5.     1002         1          m         .         .
  6.     1002         2          c         .         2
  7.     1002         3          c         .         2
  8.     1003         1          m         .         .
  9.     1003         2          f         .         .
 10.     1003         3          c         2         1

I wrote a program to do this but is very slow because
it loops over observations. 
I think that if I recode this using -mata- it would be
faster, but I not sure where to begin. Any assistance
or suggestions will be greatly appreciated.

Regards,
Ricardo 


Ricardo Ovaldia, MS
Statistician 
Oklahoma City, OK


		
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