hi, hi all,
> Dear R users, > I face to a nested pattern and despite the numerous examples in the help I am > still confused. > I sampled bugs in different habitats within sites which were within rivers > themselves within different regions. > The habitat correspond to different substrata (not systematically present in > all sites). For rivers and sites, I have environemental variables (e.g. altitude > and slope of the site, drainage area and geology of the river) and I have > only 2 regions. Note that sometimes I have only one site per river. > I would like to know the part of each spatial scale described by > environmental > data in the species richness variance. For instance is the drainage area at > the river scale that explains a large amount of species richness variance or the > altitude of the site, or the substratum, etc. The design of our data is complex. What is your outcome ? > I looked into the nlme package but I did not found how to proceed The reference document about the package nlme is certainly Pinheiro J. C. & Bates D. M. (2000) Mixed-effects models in S and S-plus. Springer Verlag, New York. 528 pp. but there is many information about this subject on the WEB (see http://www.google.fr/search?hl=fr&q=nlme&btnG=Recherche+Google&meta=) Regards, Pierre ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html