From: Yong Wang (email@example.com)
Date: Sun 30 May 2004 - 11:24:37 EST
a quick question
A larger file include many"." (stands for missing
value) for variable, say, x. after
read in the file and assign it another name such as :
but x1 is always a facotor but not numerical.
so How can I get a numeric vector from the read in data frame.
how can I replace those "." with "NA" to perform analysis.
thank you very much
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