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st: Merge problem; missing observation
From
Shubhabrata Mukherjee <[email protected]>
To
stata forum <[email protected]>
Subject
st: Merge problem; missing observation
Date
Thu, 9 Feb 2012 12:45:39 -0800 (PST)
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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