Hah - I guess I didn't mean I understood it in full as I expect I will run into it again without anticipating it.
But, now that I know the "old adage" I will look there first when I run into a problem. Also, I used the square root of machine precision instead - thanks for that, too. Thank you, thank you! I really appreciate all the help. Best, Jen On Fri, Aug 24, 2012 at 10:31 PM, R. Michael Weylandt <michael.weyla...@gmail.com> wrote: > sqrt(.Machine$double.eps) ______________________________________________ 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.