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Dear all, I am trying to model variation of distribution of species assemblages according to environmental variables. For that I use a log linear multinomial regression. In order to select variables that mostly discriminate the assemblages, I tried to apply a hierarchical partitioning protocol to my data set. For that I have adapted the all.regs() for multinomial model. The problem is that I

...nd # I cannot understand the mean of «Error in numericDeriv(form[[3]], names(ind), env) : Missing value or an Infinity produced when evaluating the model», please, can you help me. Thank you very much in advance. Michael C Michaël COEURDASSIER, PhD Department of Environmental Biology UC INRA EA3184MRT Institute for Environmental Sciences and Technology University of Franche-Comte Place Leclerc 25030 Besançon cedex FRANCE Tel : +33 (0)381 665 741 Fax : +33 (0)381 665 797 E-m@il: michael.coeurdassier@univ-fcomte.fr http://lbe.univ-fcomte.fr/ [[alternative HTML version deleted]]

...r, this correspond to the values of k and C0 determined by fitting all the data without bootstrap!!!??? I cannot find what is wrong. Please, if you find a solution, thank you to send it to me. Sincerely Michael Coeurdassier Michaël COEURDASSIER, PhD Department of Environmental Biology UC INRA EA3184MRT Institute for Environmental Sciences and Technology University of Franche-Comte Place Leclerc 25030 Besançon cedex FRANCE Tel : +33 (0)381 665 741 Fax : +33 (0)381 665 797 E-m@il: michael.coeurdassier@univ-fcomte.fr http://lbe.univ-fcomte.fr/ [[alternative HTML version deleted]]

Dear R-help list, I would like to perform multiple comparisons for lme. Can you report to me if my way to is correct or not? Please, note that I am not nor a statistician nor a mathematician, so, some understandings are sometimes quite hard for me. According to the previous helps on the topic in R-help list May 2003 (please, see Torsten Hothorn advices) and books such as Venables &