ade4 (version 1.7-19)

randtest.coinertia: Monte-Carlo test on a Co-inertia analysis (in C).

Description

Performs a Monte-Carlo test on a Co-inertia analysis.

Usage

# S3 method for coinertia
randtest(xtest, nrepet = 999, fixed=0, ...)

Value

a list of the class randtest

Arguments

xtest

an object of class coinertia

nrepet

the number of permutations

fixed

when non uniform row weights are used in the coinertia analysis, this parameter must be the number of the table that should be kept fixed in the permutations

...

further arguments passed to or from other methods

Author

Jean Thioulouse modified by Stéphane Dray

References

Dolédec, S. and Chessel, D. (1994) Co-inertia analysis: an alternative method for studying species-environment relationships. Freshwater Biology, 31, 277--294.

Examples

data(doubs)
dudi1 <- dudi.pca(doubs$env, scale = TRUE, scan = FALSE, nf = 3)
dudi2 <- dudi.pca(doubs$fish, scale = FALSE, scan = FALSE, nf = 2)
coin1 <- coinertia(dudi1,dudi2, scan = FALSE, nf = 2)
plot(randtest(coin1))