R help - Feb 2014 - CCA no scores for some constraining variables

Dear all,

I am performing a CCA using vegan package, function cca.
Data loaded are fine (presence-absence data) but when using cca function it
seems some constraining variables are not taken into account.
While asking for the summary of the CCA:
- they appear in "call:cca(formula = etc.)".
- but their scores are not shown in "Biplot scores for constraining
variables"
- and they cannot be plotted.
If they are considered alone i.e. without other constraining variables in the
CCA, their scores appear and they can be plotted.
How can it be? May someone help me to be sure they are taken into account in the
CCA with all other constraining variables, and to get their scores? Or to
understand why they are disregarded and others taken into account?

Regards,
Lise.

This seems like the ideal case for a MWE.  If we can't reproduce your error,
we can't help diagnose it!

Steve

---
Steven Wolf
Research Associate
CREATE for STEM Institute
Michigan State University
> On Feb 1, 2014, at 6:44 AM, "Paresys, Lise" <lise.paresys at
wur.nl> wrote:
> 
> Dear all,
> 
> I am performing a CCA using vegan package, function cca.
> Data loaded are fine (presence-absence data) but when using cca function it
seems some constraining variables are not taken into account.
> While asking for the summary of the CCA:
> - they appear in "call:cca(formula = etc.)".
> - but their scores are not shown in "Biplot scores for constraining
variables"
> - and they cannot be plotted.
> If they are considered alone i.e. without other constraining variables in
the CCA, their scores appear and they can be plotted.
> How can it be? May someone help me to be sure they are taken into account
in the CCA with all other constraining variables, and to get their scores? Or to
understand why they are disregarded and others taken into account?
> 
> Regards,
> Lise.
> 
>