Re: st: Question on data manipulation

["Michael Blasnik" <michael.blasnik@verizon.net>]

A slight fix to the code already offered:

bysort firm (characteristic): gen dummy = _N > 1
bysort firm innovation (dummy): replace dummy = dummy[_N]

This code assumes that a given innovation won't be listed with the same 
characteristic more than once.

Michael Blasnik
michael.blasnik@verizon.net

----- Original Message ----- 
From: "Susanne und Ulrich Kohler" <suli.kohler@web.de>
To: <statalist@hsphsun2.harvard.edu>
Sent: Friday, October 21, 2005 7:15 AM
Subject: Re: st: Question on data manipulation



> 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?
<snip>
> . 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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