Re: st: Question on data manipulation

["Andre pierre" <hcpats@hotmail.fr>]

Thanks, but this does not work: The "dummy" variable contains only "ones". I 
had already tried with with the "by:" command, but I am not sure about how 
to use it.

Regards,
Andr�



> From: Susanne und Ulrich Kohler <suli.kohler@web.de>
> Reply-To: statalist@hsphsun2.harvard.edu
> To: statalist@hsphsun2.harvard.edu
> Subject: Re: st: Question on data manipulation
> Date: Fri, 21 Oct 2005 13:15:14 +0200
>
> On Friday 21 October 2005 11:48, Andre pierre wrote:
> > I have a question, for which the answer might be simple, but I did not 
> find
> > it yet.
> > I am working on a datset that contains information on innovating firms. 
> My
> > question might be more understandable with the following example:
> > Firm 1 has 3 innovations (A, B and C). A and B have one caracteristic in
> > common (x); B and C have another caracteristic in common (g), while
> > Innovation D does not have the same caracteristic as any of the other
> > innovations.
> > I would like to create a dummy that takes the value one if an invention 
> by
> > a given firm has at least one caracteristic in common with one of the 
> other
> > innovations by the the same firm. My question is how can I get this 
> dummy?
> >
> > Firm; innovation; carateristic; dummy
> > 1; A; x; 1
> > 1; A; y; 1
> > 1; A; z; 1
> > 1; B; x; 1
> > 1; B; g; 1
> > 1; C; g; 1
> > 1; D; f; 0
>
> . by firm (charateristic): gen dummy = _N > 0
> . by firm innovation (dummy): replace dummy = dummy[_N]
>
> --
> kohler@wz-berlin.de
> +49 (0)30 25491-361
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