Displaying 5 results from an estimated 5 matches for "schielzeth".
2010 Sep 14
1
Model averaging with (and without) interaction terms
I?ve used logistic regression to create models to assess the effect of
3 variables on the presence or absence of a species, including the
interaction terms between variables and model averaging using MuMI:
model.avg
The top models (delta<4) include several models with interaction terms
and some models without; model weights are quite low for all models
(<0.25). My problem is that the models
2012 Dec 19
1
confirming a formula for use with lmer
Hello,
I recently began using R and the lme4 package to carry out linear mixed
effects analyses.
I am interested in the effects of variables 'prime','time', and 'mood'
on 'reaction_time' while taking into account the random effect
'subjects.' I've read through documentation on lme4 and came up with the
following formula for use with lmer:
2012 Oct 01
1
lme help configuring random effects
Hi Everyone,
Sorry to ask what I think is a basic question but I really haven't found my answer yet in the archives.
I am trying to run a mixed effects model in R using the lme package. My experiment is such that I am interested in the effects of Temperature (2 levels) and Species (3 levels) on Growth. I collected individuals from three populations within each species. Because individuals
2013 Feb 02
1
Mixed Models: Contribution of random variable to final estimate
Dear all,
We want to test if the invasiveStatus is predicted by the amount (quant) of animals arriving to a country of a certain species (taxonid). We are using lmer to perform the model.
The model is:
lmer(invasiveStatus~I(log(quant+1))+I(log(inDegree+1))+(1|taxonid)+(1|country), family=binomial,data=td),
where invasiveStatus is a binary variable, quant and inDegree are integer variables, and
2013 Jan 18
1
Error in mer_finalize(ans) : Downdated X'X is not positive definite, 8.
Dear All,
I have conducted an experiment in order to examine predation pressure in the
surroundings of potential wildlife road-crossing structures. I have
documented predation occurrence (binary?) in these structures and calculated
several possible explanatory variables describing the spatial heterogeneity
in several scales. At the landscape scale I have calculated the percentage
of different