[R-sig-eco] GLMM

Dear R list, I am working on land use parameters affecting the habitat selection of a bird species. In GIS, I calculated the land use parameters 100 m around the individuals. In addition, I also calculated land use in 45 random points which are not covering each other in the area where the spe

Re: [R-sig-eco] using two distance metrices in formula

Dear Jens, As far as I understood you are looking for the influence of one distance matrix on another. (Please correct me if I am wrong) Than the following reference might be useful: ter Braak, C. J. F. and Schaffers, A. P. 2004: Co-correspondence analysis: a new ordination method to relate

Re: [R-sig-eco] Low counts

Hi Tore, How does your count distribution look like? Doe you have more zero's than expected (use zero inflated models), no zero's (use zero truncated models) or is there no problem with zero's? If it is the latter, it might be useful to try the negative binomial models (glm.nb()). Zuur et al

Re: [R-sig-eco] Zero-truncated Poisson model in R

Hi Manuel, It seems that the package VGAM is taking zerotruncated models into account. You can find more info on http://www.stat.auckland.ac.nz/~yee/VGAM/index.html. You can use as a family function "posnegbinomial" (for zero truncated data with negative binomial distribution) or "pospoisson"

Re: [R-sig-eco] AIC / BIC vs P-Values / MAM

Hi Chris, There are many methods (Boyce index, maxKappa, etc.) to evaluated the predictions of a model when applied to test dataset. More information is given in the paper of Hirzel et al 2006 Ecological Modelling. Furthermore, have a look at the package PresenceAbsence (http://rss.acs.unt.ed

[R-sig-eco] adonis and model selection

Dear list, I was wondering if there is a possibility to do model selection with the method adonis of the package Vegan. If so, could any one explain me about it or give me a hint were to look? Kind regards, Maarten ___ R-sig-ecology mailing list R

Re: [R-sig-eco] QIC for conditional logistic regression + GEE

Dear Matthieu, Henric Nilsson (http://hisdu.sph.uq.edu.au/lsu/SSAI%20course/course_tools.htm) and Casper Kraan (http://www.waddenacademie.knaw.nl/fileadmin/inhoud/pdf/06-wadweten/Proefschriften/Thesis_Casper_Kraan.pdf) provide the R code for the QIC. Maybe this might be useful to you. Intere

[R-sig-eco] Predicting lm including spatial filtering

with median values, is not taken into account in the prediction. Does anyone know how to go around this? please find below a reproducable example. Looking forward to you opinions. Best regards, Maarten de Groot library(spdep) library(adespatial) library(MASS) library(ade4) library(spatialreg