I think you are attempting a many:many relational join. Try:
use file1
joinby ID using file2, unmatched(both)
This assumes that both files are sorted on ID.
Phil
At 04:16 PM 2/09/2004 -0700, you wrote:
Dear Stata support,
I have a question on merging two datasets.
Assume that I have two datasets as followings:
Master dataset is named "file1" and contains two variables:
ID var1
A 1
A 2
B 3
The using dataset is named "file2: and also contains two variables:
ID var2
A 4
A 5
A 6
I would like to merge these two files. I expect to get a new file
(file3) as followings:
ID var1 var2
A 1 4
A 1 5
A 1 6
A 2 4
A 2 5
A 2 6
B 3 .
However, after I sort both datasets by ID and then type command:
merge ID using file2.dta
The resulted file is not what I expected.
I was wondering why this happens? Can I use merge command to obtain the
file3? Thanks a lot,
Sincerely,
Jian Zhang
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Philip Ryan
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Department of Public Health
Associate Dean (Information Technology)
Faculty of Health Sciences
University of Adelaide 5005
South Australia
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http://www.public-health.adelaide.edu.au/
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