[R-sig-eco] co-correspondence package

[Gavin Simpson]

On Thu, 2008-07-17 at 08:29 -0500, Christopher Chizinski wrote:
> Dear List:
>     I am trying to run co-correspondence analysis using the package 
> cocorresp.  Everything works correctly but I was curious if anyone knew 
> if there was an R analog of the program for the predictive 
> correspondence analysis and cross valuation that is in the Matlab 
> toolbox "cocorresp"?  Everything runs in the Matlab toolbox but the 
> program relies on PLS toolbox that must be purchased (and I am almost 
> finished with my demo trial).  Also, if there was anyone that might be 
> able to give me some direction on how to write a program to test the 
> significance of the different models as mentioned in Schaffers et al. 
> (2008). "Arthropod assemblages are best predicted by plant species 
> composition" on p. 787.  Any pointers would be greatly appreciated. 
> 
> Sincerely,
> Chris

Hi Chris [Apologies for not responding sooner to your private email to
me, I've been out of the office on fieldwork and then catching up with
the email and work backlog]

Steve Juggins sent me code that implemented the crossval routine for
CCA-PLS. I started adding this to my local cocorresp source tree, but
didn't get round to completely getting everything working with the
package just yet. I should be able to take another look at this at the
weekend. Will let you know how I get on.

I have had another cocorresp user interested in the permutation t-test
you mention. I said I'd take a look at this (and I did - honest!) and it
seemed feasible, but it is field season and I have been away quite a bit
the past few months. It is on the radar, but won't happen for the next
couple of weeks as I have several papers that the boss is awaiting...

G

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