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
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
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
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"
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
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
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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
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