Hi David, Thanks for taking the time to respond to my post. Sorry for not putting an example in the original, which I've replied to with some code and a more explicit question.
Jason ______________________________________________ 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.
