[R-sig-eco] Help MARS Functions

[Miguel Cañedo]

Hi Evan!

Thank you so much! I had already removed species with less than 5
occurrences. I even tried by only leaving those species with good model
performance. Yet, I get the same error.

I have uploaded the files here (thanks for the advice!):

https://drive.google.com/open?id=0B0sFWHdTbJiLeFhfdUlfSUJOUUE

If anyone could have a quick look at the R code I would be really grateful.

Best, Miguel.

2017-02-16 12:16 GMT+01:00 Evan Palmer-Young <ecp52 at cornell.edu>:

> 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.fem at 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/>
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>


-- 
*“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/>

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