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From |
"Andre pierre" <hcpats@hotmail.fr> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Question on data manipulation |

Date |
Fri, 21 Oct 2005 13:31:53 +0200 |

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,

André

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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**Follow-Ups**:**RE : st: Question on data manipulation***From:*"Nicolas Couderc" <Nicolas.Couderc@univ-paris1.fr>

**References**:**Re: st: Question on data manipulation***From:*Susanne und Ulrich Kohler <suli.kohler@web.de>

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