Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
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,
Sytze
*
* 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/