A parallel coordinate plot would do fine. Load the package iplots and then use the command ipcp(x1, x2,...)
Antony Unwin ______________________________________________ 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.