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...duplicate lines based on sample name, but, I want the lines to be removed with a preference given to those that do not include a "Y" in the Loaded variable column. -- View this message in context: http://n4.nabble.com/Remove-duplicates-from-a-data-frame-but-with-some-special-requirements-tp965745p965745.html Sent from the R help mailing list archive at Nabble.com.