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FW: st: RE: programming in Stata


From   "Maarten Buis" <M.Buis@fsw.vu.nl>
To   <statalist@hsphsun2.harvard.edu>
Subject   FW: st: RE: programming in Stata
Date   Thu, 15 Mar 2007 12:06:04 +0100

--- Ali Khashan [mailto:Ali.Khashan@postgrad.manchester.ac.uk] wrote:
> The suggested commands work but they are not enough. They do not take into
> account that we have different mothers. for example for mother_number
> 1234567892 newvar will be 40 when it must be missing because this
> mother has no previuos child. Is there another code to work only when the
> mother_number is repeated.

That is odd, the code I sent you should (and does when I run it on my
computer) take that into account. Can you run the example I send? If you still
have this problem, could you sent me the output you get? How to run examples
is discussed on http://home.fsw.vu.nl/m.buis/stata/exampleFAQ.html#work

*---------------------- begin example ------------
clear
input double mother_number double child_number GA
1234567891            23456789      35   
1234567891            23456781      37   
1234567891            23456782      40   
1234567892            56789012      37   
1234567893            56489023      40   
1234567894            34567891      40   
1234567894            45567890      42   
end

bys mother_number (GA): gen prevGA = GA[_n-1]
list
*-------------------- end example -------------------

Hope this helps,
Maarten


-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands

visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
-----------------------------------------



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