OK thanks David
>> Thanks very much, Uwe. I will try this (on artificial data). I think >> reshape() requires a library [reshape?]. > > No. In fact, the reshape package does not have a reshape function. > > -- > > David Winsemius, MD > Heritage Laboratories > West Hartford, CT > > ______________________________________________ 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.