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Message-ID: <OFCB4733D7.55C9F1C1-ON86257A52.0061030D-86257A52.00621781@usgs.gov> Date: 2012-08-06T17:51:15Z From: Jean V Adams Subject: sapply() and by() In-Reply-To: <CALvVS-HMOtkpEMrqddiYW+GuhLipJc+9m1x2L4sb2_G9JbebJA@mail.gmail.com> An embedded and charset-unspecified text was scrubbed... Name: not available URL: <https://stat.ethz.ch/pipermail/r-help/attachments/20120806/71205797/attachment.pl>