I suspect that your "treatment" levels are perfectly nested inside the "soilgroup" levels. If this were the case you can either use one of the factor in your analysis or the other, depending on what you want to analyze.
Il giorno Wed, 11 Feb 2015 14:47:18 +0000 Mir Salam <mir.sa...@uef.fi> ha scritto: > Dear all, > > ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
