Dear statalisters, I am asking you for help because when I run
Code:
xtset firm year
I receive a message saying "repeated time values within panel".
What thats mean? I have two variables related with dates, one if the year of the observation and the other is a date of companies incorporation. I changed the formating of the date of incorporation in order that is a number of days but still have the problem.
Thank you for your help.

Best regards,

Alejandro