Dear users,
I am analyzing a panel data of firms for years 1978, 1988, 1998, 2003. The total number of firms changes across years and, as a consequence of several mergers and acquisitions, I have very few examples of firms existing in all the four years.
I also think that the total number of firms does not change randomly, but it is due to some endogenous factor (i.e. political reforms which incentive firms to merge or to go public).
Could you please tell me which are the econometric problems I could face with such an unbalanced panel? Is there any way to correct it?
Thank you in advance.
Dr. Emanuele Canegrati
_________________________________________________________________
More than messages–check out the rest of the Windows Live™.
http://www.microsoft.com/windows/windowslive/
*
* 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/
