Message-ID: <AANLkTikgZYSEAZ-dw_ifuFBHkknYvwSaZ-_+PD5CAw8k@mail.gmail.com>
Date: 2011-01-04T13:07:03Z
From: Dennis Murphy
Subject: how to subset unique factor combinations from a data frame.
In-Reply-To: <3C14C468291E41F2986AD3B30DBDA276@primpsg>
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