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st: repeated time values within panel

From   "S.H. Former" <[email protected]>
To   [email protected]
Subject   st: repeated time values within panel
Date   Tue, 27 Sep 2011 15:37:41 +0200

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?

kind regards,


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