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Re: st: Re: Retrieving a master dataset after merging


From   pec187@abdn.ac.uk
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Re: Retrieving a master dataset after merging
Date   Sun, 10 Apr 2005 12:33:51 +0100 (BST)

Also assuming that it's a one-to-one merge - if not the number of
observations would have increased.  Also assuming that the OP has
specified the merge correctly - again the number of observations might
have increased if there's more than one merge in the -using- data.

I think it's best to start from scratch.



> Well, I don't think you should ever save the new merged dataset on top of
> the master (i.e., don't use -save, replace-).  If you follow this advice
> then you could just -use master-.  Assuming you didn't follow this advice,
> you can retrieve the master dataset (if you didn't specify -update- as an
> option).  Just type:
>
> keep if _merge==1 | _merge==3
> drop _merge
>
> if the using dataset contains some variables not in the master dataset,
> you
> then drop those:
>
> drop usingvar1 usingvar2 usingvar3...
>
> Michael Blasnik
> michael.blasnik@verizon.net
>
> ----- Original Message -----
> From: "louis boakye-yiadom" <louisby@hotmail.com>
> To: <statalist@hsphsun2.harvard.edu>
> Sent: Saturday, April 09, 2005 12:24 PM
> Subject: st: Retrieving a master dataset after merging
>
>
>> Dear All,
>> After doing a -merge-, can one retrieve the master dataset? If yes, how
>> can it be done? Thank you.
>>
>> Louis


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