Thank you for the lightening replies. I tested various corStruct objects (?corClasses) using the nlme package and all work flawlessly.
My best regards to all... Constantine Tsardounis ______________________________________________ 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.