Message-ID: <1363376076899-4661534.post@n4.nabble.com>
Date: 2013-03-15T19:34:36Z
From: pedroabg
Subject: seeking tip to keep first of multiple observations per ID
In-Reply-To: <1363375871.15196.YahooMailNeo@web142606.mail.bf1.yahoo.com>
I had the same problem.
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