Message-ID: <1303761220026-3473984.post@n4.nabble.com>
Date: 2011-04-25T19:53:40Z
From: Lisa
Subject: Factor function
Dear All,
I just want to remove ?NA? from the levels of a factor. For example:
d<-data.frame(matrix(c("ww","ww","xx","yy","ww","yy","xx","yy","NA"),
ncol=3, byrow=TRUE))
> factor(d[, 3], exclude=NA)
[1] xx yy NA
Levels: NA xx yy
But ?NA? is still listed in the levels. How can I solve this problem? Thanks
in advance.
Lisa
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