Description Usage Arguments Details
calculates the fourth-corner statistic (according to Legendre et al. 1997, compiled according to Peres-Neto et al. 2012)
1 2 3 4 5 6 7 8 9 | fourth.corner(R, L, Q, chessel = FALSE)
## S3 method for class 'fc'
print(x, ...)
## S3 method for class 'fc'
summary(object, ...)
fourth.corner.ade(sitspe, speatt, env, fc.test, perm, chessel = FALSE)
|
R, env |
Matrix of sample attributes. |
L, sitspe |
Matrix of species composition. |
Q, speatt |
Matrix of species attributes |
chessel |
Logical; should the Chessel's variant of the fourth corner statistic be returned? Default is |
x, object |
Object of 'cwm' class. |
... |
Other arguments passing into |
fc.test |
Test to be chosen for fourthcorner analysis. |
perm |
Number of permutations. |
Chessel's version of the fourth corner statistic has been introduced by Peres-Neto et al. (2016), to rescale the fourth corner r statistic into the range of -1 and 1. This is achieved by dividing the observed fourth corner r by square root of the first eigenvalue for correspondance analysis of L (sitspe) matrix.
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