ade4 (version 1.7-15)

pta: Partial Triadic Analysis of a K-tables

Description

performs a partial triadic analysis of a K-tables, using an object of class ktab.

Usage

pta(X, scannf = TRUE, nf = 2)
# S3 method for pta
plot(x, xax = 1, yax = 2, option = 1:4, …)
# S3 method for pta
print(x, …)

Arguments

X

an object of class ktab where the arrays have 1) the same dimensions 2) the same names for columns 3) the same column weightings

scannf

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

nf

if scannf FALSE, an integer indicating the number of kept axes

x

an object of class 'pta'

xax, yax

the numbers of the x-axis and the y-axis

option

an integer between 1 and 4, otherwise the 4 components of the plot are displayed

…

further arguments passed to or from other methods

Value

returns a list of class 'pta', sub-class of 'dudi' containing :

RV

a matrix with the all RV coefficients

RV.eig

a numeric vector with the all eigenvalues (interstructure)

RV.coo

a data frame with the scores of the arrays

tab.names

a vector of characters with the array names

nf

an integer indicating the number of kept axes

rank

an integer indicating the rank of the studied matrix

tabw

a numeric vector with the array weights

cw

a numeric vector with the column weights

lw

a numeric vector with the row weights

eig

a numeric vector with the all eigenvalues (compromis)

cos2

a numeric vector with the \(\cos^2\) between compromise and arrays

tab

a data frame with the modified array

li

a data frame with the row coordinates

l1

a data frame with the row normed scores

co

a data frame with the column coordinates

c1

a data frame with the column normed scores

Tli

a data frame with the row coordinates (each table)

Tco

a data frame with the column coordinates (each table)

Tcomp

a data frame with the principal components (each table)

Tax

a data frame with the principal axes (each table)

TL

a data frame with the factors for Tli

TC

a data frame with the factors for Tco

T4

a data frame with the factors for Tax and Tcomp

References

Blanc, L., Chessel, D. and Dol<U+00E9>dec, S. (1998) Etude de la stabilit<U+00E9> temporelle des structures spatiales par Analyse d'une s<U+00E9>rie de tableaux faunistiques totalement appari<U+00E9>s. Bulletin Fran<U+00E7>ais de la P<U+00EA>che et de la Pisciculture, 348, 1--21. Thioulouse, J., and D. Chessel. 1987. Les analyses multi-tableaux en <U+00E9>cologie factorielle. I De la typologie d'<U+00E9>tat <U+00E0> la typologie de fonctionnement par l'analyse triadique. Acta Oecologica, Oecologia Generalis, 8, 463--480.

Examples

# NOT RUN {
data(meaudret)
wit1 <- withinpca(meaudret$env, meaudret$design$season, scan = FALSE, scal = "partial")
kta1 <- ktab.within(wit1, colnames = rep(c("S1", "S2", "S3", "S4", "S5"), 4))
kta2 <- t(kta1)
pta1 <- pta(kta2, scann = FALSE)
pta1
plot(pta1)
# }