Re: FW: st: RE: programming in Stata

[Ali Khashan <Ali.Khashan@postgrad.manchester.ac.uk>]

Thanks Maarten,Ben and Antoine
It does work now.

best wishes
Ali
Quoting Maarten Buis <M.Buis@fsw.vu.nl>:

> --- 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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