Dear all,
I want to use variable "id" to number observations. Whenever "name" or "year" changes, "id" should increase by 1. I have sorted the data by name and year (-sort name year-). I tried to solve the problem by -bysort name year: generate id=_N- but it did not work.
Hopefully someone can help me.
Regards,
Fabian
Example:
"id" "name" "year"
1 A 1990
1 A 1990
2 A 2001
3 B 2001
4 B 2003
5 B 2007
5 B 2007
6 C 2007
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