st: tsset

[Juan Manuel Jauregui <juan.manuel.jauregui@anderson.ucla.edu>]

I have a panel data of countries and years and when entering the command tsset 
country year, I receive the error message that the string is not allowed.
Obviously country is a string. How can I solve this problem? Do I have to
create
an id number for each country? How can I do that?

Thanks to all of you!

Juan

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