[R] excluding factor levels with read.table() and colClasses=
petertait at sympatico.ca
Thu Mar 16 04:37:22 CET 2006
I am reading a "|" delimited text file into R using read.table(). I am
using colClasses= to specify some variables as factors. Some of these
variables include missing values coded as "NA". Unfortunately the R code
I am using (pasted bellow) includes "NA" as one of the factor levels. Is
it possible to remove the "NA" level from a factor with in
read.table()? If not what is the most efficient way of doing this?
Thanks for your help.
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