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Re: st: Replacing duplicate values


From   Abdel Rahmen El Lahga <rahmen.lahga@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Replacing duplicate values
Date   Thu, 1 Apr 2010 17:03:25 +0200

type  help duplicates drop under Stata and you will find what you are
looking for
AbdelRahmen


2010/4/1 Pavlos C. Symeou <p.symeou@lmu.de>:
> Dear Statalisters,
>
> I would like to ask for your assistance with the following:
>
> I have a dataset which concerns patents. Every patent is assigned a number
> of International Patent Classifications (IPCs). However, there are mistakes
> in the database and certain IPCs appear more than once for a single patent,
> which is meaningless. Examples are patents with id 6 and id 7 (ipc_1, ipc_2
> etc list the number of IPCs a single patent is assigned). For the patent
> with id 6 we can see that ipc_2 and ipc_3 are the same.  Id 7 illustrates a
> more general issue. Duplicate values may not appear sequentially and may
> appear more than twice.
>
> id    ipc_1    ipc_2    ipc_3    ipc_4
> 1     A44B    G09F    H04N
> 2     A47B    G06F    H05K    E05D
> 3     A47B    G06F
> 4     A47B    H04N    H05K
> 5     A47B
> 6     A47B    F16M    F16M    H05K
> 7     A47B    A47B F16M A47B
>
> Can you suggest a way to delete the duplicate values, which can be more than
> two, and move the remaining to the left? For example patents with id 6 and
> id 7 would look like this:
>
> id    ipc_1    ipc_2    ipc_3    ipc_4
> 6     A47B    F16M    H05K
> 7     A47B    F16M
>
> Best regards,
>
> Pavlos
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>



-- 
AbdelRahmen El Lahga

*
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