Bookmark and Share

Notice: On March 31, it was announced that Statalist is moving from an email list to a forum. The old list will shut down on April 23, and its replacement, statalist.org is already up and running.


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: st: Re: Merge problem; missing observation


From   Anders Alexandersson <andersalex@gmail.com>
To   statalist@hsphsun2.harvard.edu
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
andersalex@gmail.com

On Thu, Feb 9, 2012 at 4:27 PM, Shubhabrata Mukherjee
<joy_stat@yahoo.com> wrote:
>
> Hi Nick,
>
>    I get the same result when I use a 1:1 merge.
>
> Thanks,
>
>  -Joey
>
>
>
>
> ----- Original Message -----
> From: Shubhabrata Mukherjee <joy_stat@yahoo.com>
> To: stata forum <statalist@hsphsun2.harvard.edu>
> 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)
>     -----------------------------------------

*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/


© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   Site index