Displaying 1 result from an estimated 1 matches for "tp19196464p19196464".
2008 Aug 28
3
drop unused levels in sqldf
...t without
success. Do you have any suggestions?
Thanx, Gianandrea
data(iris)
require(sqldf)
base<-sqldf("select * from iris where Species <> 'setosa'")
str(base) # Species with 3 levels!
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