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4 results for “from:Claas Damken”

R-sig-ecology (72-19): Plot question
Claas Damken · Mar 24, 2014 · r-sig-ecology

Hi Luis, whatever R code you will end up using, the example image you attached is a good example of how NOT to display ecological data. There is no ecological meaning for the lines connecting the dots (i.e, there...

R-sig-ecology Digest, (80/1): Binomial GLM: Is it the right way?
Claas Damken · Nov 1, 2014 · r-sig-ecology

Dear Ludovico, "the likelihood of colonizing or becoming extinct" is not a binary response as such. For each of your plant species, you actually can run one of two models : "Species A persists on plot YX or goes extinct" or...

R-sig-ecology Digest, Vol 71, Issue 13: SDM-model evaluation (via AUC or AIC)
Claas Damken · Feb 22, 2014 · r-sig-ecology

Hi Ludovico, I have my doubts that AUC is suitable for count data analysis, since its based on the ROC, a measure of how well a parameter can distinguish between two diagnostic groups (i.e., presence vs. absence). But for...

Lowest AIC after stepAIC can be lowered by manual reduction of variables (Florian Moser)
Claas Damken · Sep 19, 2012 · r-help

A few general comments about stepwiseAIC and a suggestion of how to select models a) Apart form the problem, that stepwise selection is not a garanty to get the best model, you need to have a lot of data to...

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