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st: Pick the first record with a value


From   Keniajin Wambui <kiangati@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Pick the first record with a value
Date   Wed, 5 Feb 2014 16:40:51 +0300

Dear All;
nparasit     numserial ndate_added
                   42231     05-Jun-00
7992             42231     03-Jun-00
                    42242     04-Jun-00
144000          42242     05-Jun-00
712800           42242     04-Jun-00
NEG               42242     08-Jun-00
371200            42242     06-Jun-00
10138              42242     07-Jun-00
                      110224      21-Dec-11
0                    110224     12-Dec-11

I am using Stata 12 on Windows 7 .I have a data set with duplicated
numserials. I want to pick the first nparasit with a value acording to
date added (ndate_added). I have tried using sorting but without
success . How can I go about it

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