Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.
| 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 * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/