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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