Dear Jim hello, I have the same question as the one you had :https://stat.ethz.ch/pipermail/r-help/2005-May/070681.html
did you find any answer to that? thanks a lot sincerely, Pooyan Rahimy ##################### PhD Student School of Environmental Sciences University of Guelph ______________________________________________ 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.