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Message-ID: <CAF=-T0gE_tXoCycpSgY1HdSQ64KhamxD5rUGJtgF1jfN4MDWFQ@mail.gmail.com> Date: 2011-10-22T11:51:52Z From: Adel ESSAFI Subject: question about aggregate In-Reply-To: <CAF=-T0iVQ0QCw79=5ofEYivLXxJ9yVv9qfG2Bwvi0zrsR75BJQ@mail.gmail.com> An embedded and charset-unspecified text was scrubbed... Name: not available URL: <https://stat.ethz.ch/pipermail/r-help/attachments/20111022/d5620785/attachment.pl>