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st: how to flag up obs that are the reverse of other obs?
I want to know how to drop some observations. For example I have the
following data, the numbers are identifiers:
Now the 4th and 5th pairs are the exact opposite of one another. I want to
drop the 5th observation, but I don't know I can use the data to flag up
such observations so that I can drop it. Could someone show me the light?
Many thanks in advance.
Department of Economics
University of Aberdeen, Scotland
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