Unique id number to each participant

[Al Bothwell]

I have results from a survey and want to assign a unique id number to each participant. There are four separate surveys of 30 responses each. I will like to generate ids starting with 100, 200, 300, and 400 respectively for each dataset. I am working with this code but don't know how to make it start from 100 etc.

gen case_id = _n

[Nick Cox]

As _n starts at 1, so also

gen case_id = 99 + _n

starts at 100, and so on.

You are referring to separate datasets, so that sounds like a different command for each.

[Al Bothwell]

Thank you! Nick