[R-sig-eco] How to test the difference between fractions of variation based on bootstrap test in redundancy analysis in R ?

[Yong Zhang]

Hi all,

Sorry for bothering you!  
When I prepared for a manuscript about variance partitioning of stream community data, I cited a wonderful paper
(Peres-Neto, P.R., et al. 2006 Variation partitioning of species data matrices: estimation and comparison of fractions. Ecology 87(10):2614-2625.), and the "adjusted R square" helps me much. 
However, I realized that they conducted a bootstrap test for fractions, and the authors mentioned that the proportions of variation explained by each do not differ significantly from each other (P=0.4865, see Figure 6).  At first, I did not know how to finish this procedure, therefore I asked for Google.  After the visiting, I recognized that  they used the MATLAB, and a related function has also been given (http://www.esapubs.org/archive/ecol/E087/158/suppl-2.htm).  Unfortunately, I'm green to the MATLAB, but I use R usually.  

My question is: how can I do this in R?  If it is possible, could anyone please give me some hints (i.e., the corresponding R code for running this).  

Thank you in advance for you time and consideration, and I apologize for any inconveninece that I brought. 

Have a nice day!

Yong



ZHANG Yong
Lab of aquatic insects & stream ecology
Dept.of Entonology, Nanjing Agricultural University
Nanjing, 210095,China 
Phone number:  (+86) -25-84395241
E-mail:2010202035 at njau.edu.cn