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Re: st: Re: Merge problem; missing observation
From
Anders Alexandersson <[email protected]>
To
[email protected]
Subject
Re: st: Re: Merge problem; missing observation
Date
Thu, 9 Feb 2012 16:49:25 -0500
Joey, maybe you have some typo somewhere? What dataset is in active
memory before the merge? Does this work?
. use fileA, clear
. merge 1:1 snp using fileB, assert(match)
Anders Alexandersson
[email protected]
On Thu, Feb 9, 2012 at 4:27 PM, Shubhabrata Mukherjee
<[email protected]> wrote:
>
> Hi Nick,
>
> I get the same result when I use a 1:1 merge.
>
> Thanks,
>
> -Joey
>
>
>
>
> ----- Original Message -----
> From: Shubhabrata Mukherjee <[email protected]>
> To: stata forum <[email protected]>
> Cc:
> Sent: Thursday, February 9, 2012 12:45 PM
> Subject: Merge problem; missing observation
>
> Hi,
>
> I have two files with the same # of observations but when I try to merge them somehow the merged dataset has one less observation. I checked that there was no observations which was dropped. What am I dong wrong here?
>
> Thanks,
>
> -Joey
>
> E.g.
>
> #############
>
> File A
>
> duplicates report snp
>
> --------------------------------------
> copies | observations surplus
> ----------+---------------------------
> 1 | 691677 0
> --------------------------------------
>
>
> #############
>
> File B
>
>
> duplicates report snp
>
> --------------------------------------
> copies | observations surplus
> ----------+---------------------------
> 1 | 691677 0
> --------------------------------------
>
> #####################
> merge file A with file B
>
> merge m:1 snp using fileB, assert(match master) keep(match)
>
> Result # of obs.
> -----------------------------------------
> not matched 0
> matched 691,676 (_merge==3)
> -----------------------------------------
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