st: Retain only one observation for each id in an unbalanced panel

From	"ALICE DOBSON" <alice_dobson@hotmail.com>
To	statalist@hsphsun2.harvard.edu
Subject	st: Retain only one observation for each id in an unbalanced panel
Date	Mon, 06 Feb 2006 10:17:23 -0500

Hi all,
I use Stata 9.1. I have an unbalanced panel of firms [firmid] over several years [year] and want to consider only the first year for each id.

Basically, I need to convert the panel data into a cross-sectional data to test for an interaction effect.

Could anybody please help me?

Best,
Alice

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