> 1. The expression you gave us is clearly not the one that produced the > error: it involved "ring.area" and "ba.beg". > > 2. You don't tell us what x and y are, so we can't reproduce anything.
Sorry, I guess that was unclear. I changed the response and independent variable names to y and x respectively, in hopes that would be clearer. Both are numeric variables. Jim ______________________________________________ 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.