A point of clarification: the measurements are continuous; the road surface is discrete with four levels, and the road capacity is discrete with five levels. Each measured point has both a surface and capacity associated with it.
Thanks, Ari I have a series of measurements > [[alternative HTML version deleted]] ______________________________________________ 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.