Hi everyone!
I seem to stuck in the problem of doing regression of different groups within the panel data.

Im having the i.Period of each year from 1970 to 2015, my aim is to find the coefficient of i.Period in the regression and find its relations with hours worked by the coefficient (positive or negative)
and i have the total hours worked(L) of different countries from 1970 to 2015 as well. each country was aligned with a number (Country=1,2......), the separate regression should be done for each country

i.Period is actually generated from the previous xtreg regression and it's the time dummies.

what code should i use?

Really appreciate the help!! Thanks!!