It looks like you have complete separation, meaning that some groups either
have occurrences at every observation (p=1) or for no observations (p=0).

Maybe you could combine some sites or treatments with low sample size

Fyi attachments get scrubbed from the list. A link to a cloud file might
work better

Good luck!


On Feb 16, 2017 03:26, "Miguel Cañedo" <mcanedo....@gmail.com> wrote:

Hi!

I am using the mars.csv function to predict the occurrences of diatoms in
the Ebro basin (Spain) and I am finding some problems that I can´t solve. I
get the following error:

Creating predictions for subsets...
glm.fit: fitted probabilities numerically 0 or 1 occurred

I am attaching the predictors + species matrix (DiatomsCV.csv), the
deviance resulting from applying the mars.glm function, the MARS functions
and the R code.

Can anyone take a quick look at it? I am really stuck...

Thank you very much in advance!

--
*“All things that are still to come lie in uncertainty; live straightway!” *

*― Seneca <https://www.goodreads.com/author/show/4918776.Seneca>, On the
Shortness of Life <https://www.goodreads.com/work/quotes/1374471>*

*Miguel Cañedo-Argüelles*
https://www.researchgate.net/profile/Miguel_Canedo-Argueelles/
http://www.linkedin.com/pub/miguel-cañedo-argüelles/23/4aa/249

*BETA Group, University of Vic*
http://www.uvic.cat/es/centro-tecnol%C3%B3gico-beta
<http://www.uvic.es/en/showrecerca/94>


*FEM Group, University of Barcelona*http://www.ub.edu/fem/index.php
<http://www.ub.edu/fem/>
_______________________________________________
R-sig-ecology mailing list
R-sig-ecology@r-project.org
https://stat.ethz.ch/mailman/listinfo/r-sig-ecology

        [[alternative HTML version deleted]]

_______________________________________________
R-sig-ecology mailing list
R-sig-ecology@r-project.org
https://stat.ethz.ch/mailman/listinfo/r-sig-ecology

Reply via email to