> How do you reply to a specific post on this board instead of the thread?
You can reply to the individual, as I just did. But I strongly suggest that you don't. You would be much better advised to discontinue debate and follow the essential advice given by nls.lm, which - no matter whether couched in terms of count of residuals - is simply to make sure that you have more independent data than variables when seeking a unique numerical solution by non-linear least squares. If you don't you'll get nonsense. S Ellison ******************************************************************* This email and any attachments are confidential. Any use...{{dropped:8}} ______________________________________________ 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.