Message-ID: <4A1DA062.3000506@gmx.net>
Date: 2009-05-27T20:19:46Z
From: Stefan Grosse
Subject: Factor level with no cases shows up in a plot
In-Reply-To: <CF736B65E2E03F42A197473E43E074A20529DDCA@w23-7928.nwrel.org>
Arthur Burke wrote:
>
> ... I get the four lines that I expected but the legend includes the
> Group level "cohort 4" .
>
> How can I get rid of "cohort 4" in Group?
>
This link might be of interest for you:
http://wiki.r-project.org/rwiki/doku.php?id=tips:data-manip:drop_unused_levels
hth
Stefan