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 in the species richness variance. I looked into the nlme package but I did not found how to proceed... Thanks for your help Nicolas Poulet Laboratoire d'Ecologie des Hydrosyst?mes LEH - UMR UPS-CNRS 5177 Universit? Paul Sabatier, b?t 4R3 118, route de Narbonne 31062 Toulouse Cedex 9
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. I looked into the nlme package but I did not found how to proceed... Thanks for your help Nicolas Poulet Laboratoire d'Ecologie des Hydrosyst?mes LEH - UMR UPS-CNRS 5177 Universit? Paul Sabatier, b?t 4R3 118, route de Narbonne 31062 Toulouse Cedex 9 PS: You may received this message twice because of mistake: sorry about that.
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 orthe> 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 proceedThe 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