Message-ID: <OF94EFA3E8.25F5A7BE-ON87257099.007D9D0D-87257099.007E2F72@usgs.gov>
Date: 2005-10-13T22:54:02Z
From: Brian S Cade
Subject: subsetting data frame using by() or tapply() or other
In-Reply-To: <1129237441.6062.5.camel@localhost.localdomain>
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