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contingincy
2002 Dec 11
3
Excluding levels in table and xtabs
I'm trying to form contingincy tables among a set of character variables
which were read from a .csv file and
have missing represented as "". I want to exclude the missing levels
from the table.
> levels(CPIC)
[1] "" "N" "Y"
> levels(Manix)
[1] "" "N" "Y"
> xtabs(~CPIC + Manix, exclude=c("",NA))