mcoa: Multiple CO-inertia Analysis

In ade4: Analysis of Ecological Data: Exploratory and Euclidean Methods in Environmental Sciences

Multiple CO-inertia Analysis

Description

performs a multiple CO-inertia analysis, using an object of class ktab.

Usage

mcoa(X, option = c("inertia", "lambda1", "uniform", "internal"), 
    scannf = TRUE, nf = 3, tol = 1e-07)
## S3 method for class 'mcoa'
print(x, ...)
## S3 method for class 'mcoa'
summary(object, ...)
## S3 method for class 'mcoa'
plot(x, xax = 1, yax = 2, eig.bottom = TRUE, ...)

Arguments

X	an object of class ktab
option	a string of characters for the weightings of the arrays options : "inertia" weighting of group k by the inverse of the total inertia of the array k "lambda1" weighting of group k by the inverse of the first eigenvalue of the k analysis "uniform" uniform weighting of groups "internal" weighting included in X$tabw
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
tol	a tolerance threshold, an eigenvalue is considered positive if it is larger than -tol*lambda1 where lambda1 is the largest eigenvalue.
x, object	an object of class 'mcoa'
...	further arguments passed to or from other methods
xax, yax	the numbers of the x-axis and the y-axis
eig.bottom	a logical value indicating whether the eigenvalues bar plot should be added

Value

mcoa returns a list of class 'mcoa' containing :

pseudoeig	a numeric vector with the all pseudo eigenvalues
call	the call-up order
nf	a numeric value indicating the number of kept axes
SynVar	a data frame with the synthetic scores
axis	a data frame with the co-inertia axes
Tli	a data frame with the co-inertia coordinates
Tl1	a data frame with the co-inertia normed scores
Tax	a data frame with the inertia axes onto co-inertia axis
Tco	a data frame with the column coordinates onto synthetic scores
TL	a data frame with the factors for Tli Tl1
TC	a data frame with the factors for Tco
T4	a data frame with the factors for Tax
lambda	a data frame with the all eigenvalues (computed on the separate analyses)
cov2	a numeric vector with the all pseudo eigenvalues (synthetic analysis)

Author(s)

Daniel Chessel
Anne-Béatrice Dufour [e-mail]

References

Chessel, D. and Hanafi, M. (1996) Analyses de la co-inertie de K nuages de points, Revue de Statistique Appliquée, 44, 35–60.

Examples

data(friday87)
w1 <- data.frame(scale(friday87$fau, scal = FALSE))
w2 <- ktab.data.frame(w1, friday87$fau.blo, tabnames = friday87$tab.names)
mcoa1 <- mcoa(w2, "lambda1", scan = FALSE)
mcoa1
summary(mcoa1)
plot(mcoa1)

ade4 documentation built on Feb. 16, 2023, 7:58 p.m.