From lorenz at usgs.gov  Thu Dec  6 16:12:24 2012
From: lorenz at usgs.gov (Lorenz, David)
Date: Thu, 6 Dec 2012 09:12:24 -0600
Subject: [Rd] factor(x, exclude=y) if x is a factor
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[Rd] factor(x, exclude=y) if x is a factor
Lorenz, David