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st: Identifying first observation in each panel of unbalanced panel
From
Ivan Png <[email protected]>
To
[email protected]
Subject
st: Identifying first observation in each panel of unbalanced panel
Date
Mon, 4 Jun 2012 13:13:15 -0400
I am analyzing an unbalanced panel of company data, organized by
company (gvkey) and year. I want to create a flag to the first
observation of each company in the panel. I tried
. sort gvkey year
. by gvkey , sort: gen flag = 1 if _n == 1
However, this only flagged flag = 1 if a company was present in year 1
of the panel. It missed any company that appeared in later years.
I searched statalist and found this:
http://www.stata.com/statalist/archive/2005-04/msg00334.html
But it doesn't work. I'd be grateful for any relevant help.
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