Please note that Kirsten is cross-posting to stats.stackexchange.com creating extra work for everyone.
-- ------------------------------------------------------------------------ Frank E Harrell Jr Professor and Chairman School of Medicine Department of *Biostatistics* *Vanderbilt University* [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.