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st: problem with repeated time values within panel


From   "S.H. Former" <S.H.Former@uvt.nl>
To   statalist@hsphsun2.harvard.edu
Subject   st: problem with repeated time values within panel
Date   Tue, 27 Sep 2011 13:02:32 +0200

Dear reader,

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. Stata gives the command that there are repeated time values within the panel. I understand that this is a problem but each patent is a different one and should be included. Has anyone got a solution for me so that I still can use the database? Thanks in advance,

kind regards,
Sytze Former


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