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Re: st: Pick the first record with a value


From   Keniajin Wambui <kiangati@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Pick the first record with a value
Date   Wed, 5 Feb 2014 17:01:03 +0300

Hi Lucas;
Thanks for that.
I want to pick the first nparasit with a value sorting by date and numserial.

On Wed, Feb 5, 2014 at 4:49 PM, Lucas Ferreira Mation
<lucasmation@gmail.com> wrote:
> I did not understand what you want exactly.
> But as long as ndate_added is a numeric variable (formatted as a date)
> and not a string variable it should be possible to do sorting or egen.
>
> For example:
>
> egen I=min(ndate_added), by(numserial)
>
> picks the first date of each group of numserial observations.
>
> On Wed, Feb 5, 2014 at 11:40 AM, Keniajin Wambui <kiangati@gmail.com> wrote:
>> 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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