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 -- %~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~% Dr. Gavin Simpson [t] +44 (0)20 7679 0522 ECRC, UCL Geography, [f] +44 (0)20 7679 0565 Pearson Building, [e] gavin.simpsonATNOSPAMucl.ac.uk Gower Street, London [w] http://www.ucl.ac.uk/~ucfagls/ UK. WC1E 6BT. [w] http://www.freshwaters.org.uk %~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~% _______________________________________________ R-sig-ecology mailing list R-sig-ecology@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-ecology