oh god, thanks!now it looks so simple!!
-- View this message in context: http://r.789695.n4.nabble.com/dummy-variable-tp4637347p4637574.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
