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Message-ID: <5057B976.4080207@sapo.pt> Date: 2012-09-17T23:59:50Z From: Rui Barradas Subject: help with calculation from dataframe with multiple entries per sample In-Reply-To: <1347923753.2562.YahooMailNeo@web142501.mail.bf1.yahoo.com> An embedded and charset-unspecified text was scrubbed... Name: not available URL: <https://stat.ethz.ch/pipermail/r-help/attachments/20120918/e72c8d92/attachment.pl>