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Message-ID: <OF56C90DBF.7C02CEF8-ON86257942.00491954-86257942.004A142E@usgs.gov> Date: 2011-11-08T13:28:58Z From: Jean V Adams Subject: Aggregate or extract function ? In-Reply-To: <1320740912776-4015263.post@n4.nabble.com> An embedded and charset-unspecified text was scrubbed... Name: not available URL: <https://stat.ethz.ch/pipermail/r-help/attachments/20111108/b47d6cda/attachment.pl>