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Message-ID: <OF80502712.63102EC9-ON86257941.007B6E57-86257941.007BCB27@usgs.gov> Date: 2011-11-07T22:31:51Z From: Jean V Adams Subject: Aggregate or extract function ? In-Reply-To: <1320699055205-4013673.post@n4.nabble.com> An embedded and charset-unspecified text was scrubbed... Name: not available URL: <https://stat.ethz.ch/pipermail/r-help/attachments/20111107/c1580e22/attachment.pl>