Hi all, I have a manuscript nearly ready to go looking at a factorial analysis (inside and outside a Caribbean marine reserve) of how the biomass of predatory fish affects the proportion of survey transects containing urchins (more predators leads to fewer urchins). I would like to add some regression analysis, but my linear models with binomial errors are overdispersed because the data are nonlinear (negative power by the look of it). I have spent some time playing with gnlr but have realised that it is unlikely that I will be able to get the analysis to a publishable standard. If anyone is interested in working with me to complete this analysis I would happily include them as a co-author on the paper. The data are appended below in case anyone wants to see it. Thanks, Alastair
Pred_biomass proportion of transects with urchins 372.25 0.28571 173.66 0.14286 205.00 0.28571 3436.77 0.00000 862.54 0.00000 387.82 0.00000 385.50 0.00000 345.83 0.28571 132.61 1.00000 - Note there seems to be an additional wrinkle as the biomass data are difficult to normalise. __ Dr Alastair Harborne Marine Spatial Ecology Lab School of Biosciences Hatherly Laboratory University of Exeter, Prince of Wales Road Exeter, EX4 4PS, UK Phone: 01392-263784 Fax: 01392-263700 Skype name: al_harborne Group website: http://www.ex.ac.uk/msel Personal website: http://biosciences.exeter.ac.uk/staff/profiles/profile.php?id=alastair_harborne ______________________________________________ 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.
