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Re: st: repeated time values within panel


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: repeated time values within panel
Date   Tue, 27 Sep 2011 15:19:34 +0100

I stand by my earlier answer, ignored here, at

http://www.stata.com/statalist/archive/2011-09/msg01198.html

The fact of multiple patents per company-year is not a problem except
in so far as you might have a fixed idea that you must apply time
series methods which require balanced panels. Of course, you could
reduce your data to counts of patents for each company and year and
that could be handled using such methods, but that may or may not be
helpful in your project. That aside, what you describe seems a natural
and unsurprising feature, but as in your previous you don't give any
details on what you intend to do, so useful comment is difficult.

By the way, if knowledge transfer is neither dependent or independent,
how is it to be taken accounf of?

Nick

On Tue, Sep 27, 2011 at 2:37 PM, S.H. Former <S.H.Former@uvt.nl> wrote:

> I want to perform a panel data analysis but I have some problem with my data. For each entity (companies in my case) I am looking at the patents they have assigned. Only some companies have assigned multiple patents in certain years. So for example, company X has assigned 4 unique patents in 1999 while Company Y assigned 143 and Company Z only 1. Stata gives the command that there are repeated time values within the panel.
>
> So to clarify it, when a company assigned multiple patents I still want to incorporate them all because it tells me something about the experience in knowledge transfer. The experience of knowledge transfer is taken into account by performing a panel data analysis (it is not a dependent or independent variable). Has anyone
>
> Has anyone got a solution for me so that I still can use the database and incorporate all the patents so that experience is considered as well?

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