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Re: st: Improve matching


From   Nick Cox <njcoxstata@gmail.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Improve matching
Date   Fri, 17 May 2013 16:41:53 +0100

gen namelength = length(trim(firm))
bysort id (namelength) = trim(firm[_N])

Then if all is well

by id : keep if _n == _N

I threw in trimming of leading and trailing spaces too.

(For "STATA" read "Stata".)
Nick
njcoxstata@gmail.com


On 17 May 2013 16:20, Seliger  Florian <seliger@kof.ethz.ch> wrote:
> Dear Statalist,
>
> I want to improve matching of two datasets. I use a matching software, but want to prepare the datasets with STATA.
> One dataset is in panel structure, i.e. I have multiple observations per ID:
>
> ID           firm
> 314         POLYTYPE
> 314         POLYTYPE  MASCHINENFABRIK
> 314         POLYTYPE  NA
> 314         POLYTYPE
> 314         POLYTYPE
> 314         POLYTYPE
>
> The length of the firm name may vary across IDs.
> I noticed that it is necessary to keep only the ID with the LONGEST NAME, in this case "POLYTYPE MASCHINENFABRIK".
> It is necessary to delete all other IDs for the same observation to enable a proper matching (due to the software).
>
> Any suggestions how I could only keep the LONGEST NAME IDs (each observation has different names, and within each observation each ID has different names, there is no regularity) in STATA?
>
> Thank you for your consideration.
>
> Best,
> Florian
>
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