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Message-ID: <CAF=-T0g=i92CXWuVeD6FgUeHQhANEZgmhW5s5RDHD_JiKeeGhA@mail.gmail.com> Date: 2011-10-22T12:19:29Z From: Adel ESSAFI Subject: question about aggregate In-Reply-To: <CAEhWdG4GZbzDJrbHFyrpAq+QBeAHCHrTyFr5wAHB+=akACAvgA@mail.gmail.com> An embedded and charset-unspecified text was scrubbed... Name: not available URL: <https://stat.ethz.ch/pipermail/r-help/attachments/20111022/4847692e/attachment.pl>