ade4 (version 1.5-2)

costatis: STATIS and Co-Inertia : Analysis of a series of paired ecological tables

Description

Does the analysis of a series of pairs of ecological tables. This function uses Partial Triadic Analysis (pta) and coinertia to do the computations.

Usage

costatis(KTX, KTY, scannf = TRUE)

Arguments

KTX

an objet of class ktab

KTY

an objet of class ktab

scannf

a logical value indicating whether the eigenvalues bar plot should be displayed

Value

• a list of class coinertia, subclass dudi. See coinertia

encoding

latin1

WARNING

IMPORTANT : KTX and KTY must have the same k-tables structure, the same number of columns, and the same column weights.

Details

This function takes 2 ktabs. It does a PTA (partial triadic analysis: pta) on each ktab, and does a coinertia analysis (coinertia) on the compromises of the two PTAs.

References

Thioulouse J., Simier M. and Chessel D. (2004). Simultaneous analysis of a sequence of paired ecological tables. Ecology 85, 272-283..

Simier, M., Blanc L., Pellegrin F., and Nandris D. (1999). Approche simultan�e de K couples de tableaux : Application a l'�tude des relations pathologie v�g�tale - environnement. Revue de Statistique Appliqu�e, 47, 31-46.

Examples

data(meau)
wit1 <- withinpca(meau$env, meau$design$season, scan = FALSE, scal = "total")
pcaspe <- dudi.pca(meau$spe, scale = FALSE, scan = FALSE, nf = 2)
wit2 <- within(pcaspe, meau$design$season, scan = FALSE, nf = 2)
kta1 <- ktab.within(wit1, colnames = rep(c("S1","S2","S3","S4","S5","S6"), 4))
kta2 <- ktab.within(wit2, colnames = rep(c("S1","S2","S3","S4","S5","S6"), 4))
costatis1 <- costatis(kta1, kta2, scan = FALSE)
plot(costatis1)