> -bysort name year: generate id=_N- but it did not work.
the problem is that _N (id) contains the number of observations
in each combination -name year- which is in general not a good
identifier.
instead you can use Martin's suggestion - egen ,group() - or you
generate that index via:
bysort name year: gen id = _n == 1
replace id = sum(id)
Johannes
>
> 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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