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factor levels

To: s-news@lists.biostat.wustl.edu
Subject: factor levels
From: yiwu ye <yiwu21111958@yahoo.com>
Date: Thu, 18 Jan 2007 16:38:42 -0800 (PST)
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Dear list,

I have the following problem. Could anyone help?

x_as.factor(letters[1:5])
x_x[-4]
levels(x)
The levels(x) still gives you 5 rather than 4 levels. Of course, I can do levels(as.factor(as.character(x)) to  get rid of the non-existing factor level. But, I think there must be a simpler way.

Thanks

Yiwu


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