Hi Jesse, I have most if not all the code from the ter Braak & Schaffers paper ported to R ins some state or other. Steve Juggins sent me the CCA-PLS port IIRC but I've been distracted with other things and this method is not in cocorresp (yet! but I've been saying that for years :-( ). We don't have anything in Vegan that will do CV for you.
It wouldn't be the most efficient of codes but it would be relatively simple to do CV by hand with Vegan. IIRC the CV for CoCA is leave-one-out, so you just need to loop over the rows, fit the cca to all the data minus the ith row and then predict for the ith row and compare with the observed. I've just gotten back from a few weeks out of the office so I'm going to be tied up for a wee while clearing the backlog but if you can't get this working get back in touch and I'll see if I can flesh these ideas out a bit more in code for you. All the best G On 14 August 2015 at 16:13, Jesse Becker <jcbecke...@gmail.com> wrote: > A couple of years ago I was doing some Co-Correspondence analysis and asked > if the cross validation method in ter Braak and Shaffers (2004) which is > available in the cocoresp package had been implemented to work on a CCA > output from vegan? I ended up not needing it for that project, but I'm > using the method for another paper. In an effort to put CoCA and CCA on > the same footing in terms of evaluating fit, I'd like to use the cross > validation on CCA. I don't have access to MATLAB, I do have access to R > (and am a user, not a programmer) > > So has anyone adapted the MATLAB code to R? Gavin? > > Thanks in advance! > > Jesse C. Becker, Ph.D. > 765.285.8889 office > 512.587.4428 cell > jcbecker at bsu.edu > jcbecker42 at gmail.com > > Call > Send SMS > Add to Skype > You'll need Skype CreditFree via Skype > > [[alternative HTML version deleted]] > > _______________________________________________ > R-sig-ecology mailing list > R-sig-ecology@r-project.org > https://stat.ethz.ch/mailman/listinfo/r-sig-ecology > -- Gavin Simpson, PhD [[alternative HTML version deleted]] _______________________________________________ R-sig-ecology mailing list R-sig-ecology@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-ecology
