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Re: st: Merging only the common elements, and dropping duplicates


From   "Michael N. Mitchell" <Michael.Norman.Mitchell@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Merging only the common elements, and dropping duplicates
Date   Wed, 16 Jun 2010 00:22:58 -0700

Dear George

  Using Stata 11.0 and above, you can do this...

. use database1, clear
. merge 1:1 account using database2, keep(match)

and the resulting merged file will contain only matches.

I hope this helps,

Michael N. Mitchell
Data Management Using Stata      - http://www.stata.com/bookstore/dmus.html
A Visual Guide to Stata Graphics - http://www.stata.com/bookstore/vgsg.html
Stata tidbit of the week         - http://www.MichaelNormanMitchell.com



On 2010-06-16 12.13 AM, George Chioran wrote:
Dear statalisters,

I am trying to merge 2
databases to match persons with accounts; however I discovered that when I do
this, the final database contains a lot of duplicates.
Database 1 looks like
this. I sort it by account.

Person  Account
2              311
2              311
2              311
2              311
2              413
2              413
2              413

Database 2 looks like
this. I sort it by account.

Account B_S
311         b
311         b
311         b

To merge them, I load
database 1 and merge it using database 1. But when I do this, I would like to
have a final database that contains only the common observation of both. But I get database 3
that looks like this.

Person Account B_S
2              311         b
2              311         b
2              311         b
2              311         b
2              413         .
2              413         .
2              413         .

Is there a way to get
just the common observations? I would like my final database to have just:
Person Account B_S

2              311         b
2              311         b
2              311         b

Thank you,
George



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