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Message-ID: <7F02926F-A8B4-42B8-89F1-864CE20B5648@dal.ca> Date: 2011-11-01T17:16:23Z From: Aurelie Cosandey Godin Subject: Removal/selecting specific rows in a dataframe conditional on 2 columns An embedded and charset-unspecified text was scrubbed... Name: not available URL: <https://stat.ethz.ch/pipermail/r-help/attachments/20111101/ba9eb07c/attachment.pl>